diff --git a/‎scripts/pm/fleet-write/dispatch.mjs‎
Lines changed: 230 additions & 81 deletions b/‎scripts/pm/fleet-write/dispatch.mjs‎
Lines changed: 230 additions & 81 deletions
diff --git a/‎scripts/pm/fleet-write/ops.mjs‎
Lines changed: 17 additions & 1 deletion b/‎scripts/pm/fleet-write/ops.mjs‎
Lines changed: 17 additions & 1 deletion
diff --git a/‎scripts/pm/issue-create.mjs‎
Lines changed: 2 additions & 1 deletion b/‎scripts/pm/issue-create.mjs‎
Lines changed: 2 additions & 1 deletion
diff --git a/‎scripts/pm/label-write.mjs‎
Lines changed: 3 additions & 2 deletions b/‎scripts/pm/label-write.mjs‎
Lines changed: 3 additions & 2 deletions
diff --git a/‎scripts/pm/post-stamped.mjs‎
Lines changed: 80 additions & 1 deletion b/‎scripts/pm/post-stamped.mjs‎
Lines changed: 80 additions & 1 deletion
diff --git a/‎scripts/pm/with-fleet.sh‎
Lines changed: 23 additions & 8 deletions b/‎scripts/pm/with-fleet.sh‎
Lines changed: 23 additions & 8 deletions
@@ -84,8 +84,22 @@ export const TARGET_OWNER = 'objectstack-ai';
 export const TRANSPORT_ENV = 'OS_FLEET_TRANSPORT';
 export const TRANSPORTS = Object.freeze(['direct', 'dispatch', 'auto']);
 
-/** The session id a dispatch carries; a seat sets it to its own `session_…`. */
+/**
+ * The session id a dispatch carries. A cloud seat's is READ FROM THE CONTAINER
+ * (`CONTAINER_SESSION_ENV` below); this variable OVERRIDES it — for a local
+ * checkout, or a test — and an explicit value that is malformed is refused,
+ * never replaced by the container's.
+ */
 export const SESSION_ENV = 'OS_FLEET_SESSION';
+/**
+ * The container's own name for the seat's session: the cloud harness sets
+ * `CLAUDE_CODE_REMOTE_SESSION_ID=cse_<id>` in every cloud seat container
+ * measured, and `session_<id>` — the same tail — is the seat's id in the shape
+ * `SESSION_SHAPE` takes. Read only when `SESSION_ENV` is absent; a subagent
+ * dev runs in its PM's container and so inherits the DISPATCHING seat's id,
+ * which is the identity the envelope should carry.
+ */
+export const CONTAINER_SESSION_ENV = 'CLAUDE_CODE_REMOTE_SESSION_ID';
 
 /** The merge method the auto-merge op arms. ⛔ Never a free string. */
 export const MERGE_METHOD = 'SQUASH';
@@ -113,6 +127,8 @@ export const PAYLOAD_KEYS = Object.freeze(['request_id', 'repo', 'session', 'act
 
 export const REQUEST_ID_SHAPE = /^[A-Za-z0-9][A-Za-z0-9._-]*$/;
 export const SESSION_SHAPE = /^session_[A-Za-z0-9]{6,}$/;
+/** The container variable's shape; group 1 is the tail `session_` is prefixed to. */
+export const CONTAINER_SESSION_SHAPE = /^cse_([A-Za-z0-9]{6,})$/;
 export const TARGET_REPO_SHAPE = new RegExp(`^${TARGET_OWNER}/[A-Za-z0-9_.-]+$`);
 
 /**
 
@@ -625,7 +625,8 @@ const USAGE = [
   '  The body comes from a file, always; the title from a file by preference. A batch of N ≥ 5 cards is',
   '  announced first:  node scripts/pm/write-pace.mjs --announce-batch N --kind "issue-create POST"',
   '  OS_FLEET_TRANSPORT=direct|dispatch|auto (default auto): dispatch sends the create through the fleet-write relay as',
-  '  objectstack-fleet[bot]; auto takes it in a cloud seat container (OS_FLEET_SESSION must carry this seat\'s session_… id).',
+  "  objectstack-fleet[bot]; auto takes it in a cloud seat container (the seat's session is read from the container's",
+  '  CLAUDE_CODE_REMOTE_SESSION_ID; OS_FLEET_SESSION overrides it — a local checkout, a test) and direct elsewhere.',
   `  Exits: 0 created and read back · ${EXIT_USAGE} usage · ${EXIT_PREREQUISITE} prerequisite · ${EXIT_READ_BACK_MISMATCH} read-back mismatch · ${EXIT_PLATFORM_REFUSAL} platform refused · ${EXIT_UNCONFIRMED} dispatched but UNCONFIRMED · ${EXIT_WRITE_PACE_REFUSED} throttle refused`,
 ].join('\n');
 
 
@@ -490,8 +490,9 @@ const USAGE = [
   '  ⛔ Never `PUT .../labels` and ⛔ never MCP `issue_write` (lock 1 denies it).',
   '',
   '  OS_FLEET_TRANSPORT=direct|dispatch|auto (default auto): dispatch packs step ③ into ONE repository_dispatch the',
-  '  fleet-write relay executes as objectstack-fleet[bot]; auto takes it in a cloud seat container (OS_FLEET_SESSION',
-  '  must carry this seat\'s session_… id there) and direct elsewhere. Steps ①, ② and ④ are the same either way.',
+  '  fleet-write relay executes as objectstack-fleet[bot]; auto takes it in a cloud seat container (the seat\'s session is',
+  "  read from the container's CLAUDE_CODE_REMOTE_SESSION_ID; OS_FLEET_SESSION overrides it — a local checkout, a test)",
+  '  and direct elsewhere. Steps ①, ② and ④ are the same either way.',
   '',
   '  Exits: 0 landed+read-back · 2 usage · 3 prerequisite (no token/route, or rate-limit exhausted)',
   '         4 read-back disagrees with the target · 5 every channel refused · 6 dispatched but UNCONFIRMED.',
 
@@ -867,6 +867,7 @@ import {
 } from './check-half-states.mjs';
 import { readClause2Line } from './clause2-line.mjs';
 import { EXIT_UNCONFIRMED, fallbackText, packRequest, resolveRoute, sendFleetWrite, unconfirmedText } from './fleet-write/dispatch.mjs';
+import { MAX_BODY_BYTES, TRANSPORT_ENV } from './fleet-write/ops.mjs';
 import { refusalText as relayRefusalText } from './fleet-write/validate.mjs';
 import { isWriteMethod, noteResponse, paceWrite } from './write-pace.mjs';
 
@@ -2828,6 +2829,53 @@ export function relayExitFor(result) {
   return EXIT_UNCONFIRMED;
 }
 
+/**
+ * The size route: the relay's body cap decides the transport for THIS write,
+ * and nothing else does. Pure.
+ *
+ * The relay carries a body of at most `MAX_BODY_BYTES` UTF-8 bytes (a
+ * `repository_dispatch` `client_payload` is capped by the platform at 64 KB,
+ * hence the 60,000-byte body cap in `fleet-write/ops.mjs`), so a body over it
+ * cannot take the relay however live the relay is:
+ *
+ *   - under `auto`, THIS write goes DIRECT — as the seat's own user, the token
+ *     this process holds — and the route's reason becomes the ONE printed line
+ *     that says so, naming the bytes, the cap and the identity. ⛔ Never silent.
+ *   - under an explicit `OS_FLEET_TRANSPORT=dispatch` the route becomes a
+ *     PREREQUISITE refusal (exit 3) naming the bytes: the operator asked for
+ *     the relay, and a fall-back would change the identity the write is booked
+ *     against.
+ *
+ * ⛔ Only the size re-routes. A refused op, a failed run and an UNCONFIRMED
+ * outcome keep the register `relayExitFor` gives them; and ⛔ there is no
+ * compression codec — a body this size is the thing to shrink, not to encode.
+ * A route that is not `dispatch`, one already carrying an error, or a body at
+ * or under the cap comes back unchanged (flagged `sizeRouted: false`).
+ */
+export function sizeRoute(route, body) {
+  const bytes = Buffer.byteLength(String(body ?? ''), 'utf8');
+  const cap = MAX_BODY_BYTES;
+  if (!route || route.transport !== 'dispatch' || route.error || bytes <= cap) return { ...route, bytes, cap, sizeRouted: false };
+  const size = `the body is ${grouped(bytes)} UTF-8 bytes, ${grouped(bytes - cap)} over the relay's ${grouped(cap)}-byte body cap (a repository_dispatch client_payload is capped by the platform at 64 KB)`;
+  if (route.requested === 'auto') {
+    return {
+      ...route,
+      transport: 'direct',
+      bytes,
+      cap,
+      sizeRouted: true,
+      reason: `${TRANSPORT_ENV} is auto → direct for THIS write: ${size}, so it cannot take the relay. Written DIRECT as the seat's own user (the token this process holds), not as objectstack-fleet[bot]. ⛔ Not compressed: a body this size is the thing to shrink.`,
+    };
+  }
+  return {
+    ...route,
+    bytes,
+    cap,
+    sizeRouted: true,
+    error: `${TRANSPORT_ENV}=dispatch but ${size} — the relay cannot carry it. ⛔ Not falling back to direct: the operator asked for the relay, and the fall-back would change the identity the write is booked against. Shrink the body, or run under ${TRANSPORT_ENV}=auto to let THIS write go direct as the seat's own user.`,
+  };
+}
+
 // ---------------------------------------------------------------------------
 // Live layer
 // ---------------------------------------------------------------------------
@@ -3074,7 +3122,10 @@ async function main(argv) {
 
   // The transport, decided and SAID before anything leaves. A dry run makes no
   // request, so a route that cannot be resolved is a note there, not a refusal.
-  const route = await resolveRoute(process.env);
+  // The size route runs on the RENDERED body (the stamp is part of what is
+  // sent): over the relay's cap, `auto` takes direct for this write and the
+  // line below says so; explicit dispatch is refused.
+  const route = sizeRoute(await resolveRoute(process.env), rendered.body);
   if (route.error && !options.dryRun) {
     console.error(`post-stamped: PREREQUISITE NOT MET — ${route.error}\n  NOTHING WAS WRITTEN.`);
     return EXIT_PREREQUISITE_NOT_MET;
@@ -3264,6 +3315,7 @@ const SELF_TEST_BATTERIES = Object.freeze({
   'the shared rule: this tool and H56 cannot come to disagree': 6,
   'the keyed lines: a claim\'s exact-value fields, judged by the readers that own them': 20,
   'the relay transport: the same act as one op, the comment found on the board, the exit register kept apart': 12,
+  "the size route: over the relay's body cap under auto THIS write goes direct with one line naming bytes, cap and identity; at or under it the relay; explicit dispatch refuses naming the bytes; nothing else re-routes": 12,
 });
 const SELF_TEST_BATTERY_FLOOR = 16;
 const UNATTRIBUTED_BATTERY = '(unattributed)';
@@ -4356,6 +4408,33 @@ export function selfTest() {
     t('structural: in main a dry run returns before the relay can be reached, and ONE read-back verdict serves both transports', mainSource.indexOf('if (options.dryRun) {') < mainSource.indexOf('await writeViaRelay(') && (mainSource.match(/readBackVerdict\(\{/g) ?? []).length === 1);
   }
 
+  // ── the size route ───────────────────────────────────────────────────────
+  battery("the size route: over the relay's body cap under auto THIS write goes direct with one line naming bytes, cap and identity; at or under it the relay; explicit dispatch refuses naming the bytes; nothing else re-routes");
+  {
+    const AUTO = { requested: 'auto', transport: 'dispatch', reason: 'auto → dispatch (fixture)', error: null, failed: null, session: 'session_01ABCDEFGHJKMNPQRSTVWXYZ' };
+    const STRICT = { ...AUTO, requested: 'dispatch', reason: 'OS_FLEET_TRANSPORT=dispatch (fixture)' };
+    const ofBytes = (n) => 'x'.repeat(n);
+    const over = sizeRoute(AUTO, ofBytes(MAX_BODY_BYTES + 1));
+    t('one byte over the cap under auto: DIRECT for this write, flagged as size-routed, no error', over.transport === 'direct' && over.sizeRouted === true && over.error === null);
+    t('…and the ONE line names the bytes sent', over.reason.includes(`${grouped(MAX_BODY_BYTES + 1)} UTF-8 bytes`));
+    t('…the cap', over.reason.includes(`${grouped(MAX_BODY_BYTES)}-byte body cap`));
+    t("…and the identity used — the seat's own user, not the fleet bot", over.reason.includes("seat's own user") && over.reason.includes('not as objectstack-fleet[bot]'));
+    const under = sizeRoute(AUTO, ofBytes(MAX_BODY_BYTES - 1));
+    t('one byte under the cap under auto: the relay, the route untouched', under.transport === 'dispatch' && under.sizeRouted === false && under.reason === AUTO.reason && under.error === null);
+    t('…and exactly AT the cap is still the relay (the validator admits it)', sizeRoute(AUTO, ofBytes(MAX_BODY_BYTES)).transport === 'dispatch');
+    const strict = sizeRoute(STRICT, ofBytes(MAX_BODY_BYTES + 1));
+    t('⛔ explicit dispatch one byte over: a PREREQUISITE refusal naming the bytes and saying it will NOT fall back, the transport NOT changed', strict.transport === 'dispatch' && typeof strict.error === 'string' && strict.error.includes(grouped(MAX_BODY_BYTES + 1)) && strict.error.includes('Not falling back'));
+    t('bytes are UTF-8 BYTES, not characters: 20,001 three-byte characters are over the cap, 20,000 are not', sizeRoute(AUTO, '中'.repeat(20_001)).transport === 'direct' && sizeRoute(AUTO, '中'.repeat(20_000)).transport === 'dispatch');
+    t('a route already direct is never touched, whatever the size', sizeRoute({ ...AUTO, transport: 'direct' }, ofBytes(MAX_BODY_BYTES + 1)).sizeRouted === false);
+    t('a route that already carries an error is never touched — the size never masks a missing session', sizeRoute({ ...STRICT, error: 'no session' }, ofBytes(MAX_BODY_BYTES + 1)).error === 'no session');
+    t('⛔ nothing else re-routes: a refused dispatch, a failed run and UNCONFIRMED keep their register', relayExitFor({ state: 'refused' }) === EXIT_PREREQUISITE_NOT_MET && relayExitFor({ state: 'failure' }) === EXIT_NOT_STORED && relayExitFor({ state: 'timeout' }) === EXIT_UNCONFIRMED);
+    const ownSource = readFileSync(SELF_PATH, 'utf8');
+    const mainSource = ownSource.slice(ownSource.indexOf('async function main(argv)'), ownSource.indexOf('// --self-test — offline'));
+    t('structural: main hands the resolved route through sizeRoute on the RENDERED body before the transport line is printed', mainSource.includes('sizeRoute(await resolveRoute(process.env), rendered.body)') && mainSource.indexOf('sizeRoute(') < mainSource.indexOf('transport ${route.transport}'));
+    // An import SHAPE, not the module's bare name: the name is spelled in this very line, so a name test could never fail.
+    t('⛔ no compression codec: this file imports nothing from zlib', /from '(node:)?zlib'/.test(ownSource) === false && /require\('(node:)?zlib'\)/.test(ownSource) === false);
+  }
+
   // The floor, evaluated last: a battery that stops running names itself here.
   const failed = cases.filter((c) => !c.ok);
   for (const c of cases) console.log(`  ${c.ok ? '✓' : '✗'} ${c.name}`);
 
@@ -24,8 +24,10 @@
 #   --via dispatch  `--repo owner/name --actions <file>`; never a command — the relay hands out no token.
 #   --via auto      (the default, or OS_FLEET_TRANSPORT) — asks `fleet-write/dispatch.mjs --route`,
 #                   the ONE selector every tool shares: `dispatch` only when the cloud discriminator,
-#                   a well-formed OS_FLEET_SESSION and a live relay on the board all hold, `direct`
-#                   otherwise (the line says which condition failed). A COMMAND under auto that
+#                   the seat's session (read from the container's CLAUDE_CODE_REMOTE_SESSION_ID;
+#                   OS_FLEET_SESSION overrides it — a local checkout, a test) and a live relay on the
+#                   board — the workflow file on main AND its Actions state `active` — all hold,
+#                   `direct` otherwise (the line says which condition failed). A COMMAND under auto that
 #                   resolves to `dispatch` is REFUSED (exit 3) with the actions-file spelling: it
 #                   cannot be run as the fleet there, and running it as the session's login instead
 #                   would be a silent change of identity.
@@ -95,7 +97,7 @@ log() { printf 'with-fleet: %s\n' "$*" >&2; }
 
 ST_PASS=0
 ST_FAIL=0
-ST_MIN_CASES=28
+ST_MIN_CASES=29
 st_case() {
   local name="$1" got="$2" want="$3"
   if [[ "$got" == "$want" ]]; then
@@ -241,14 +243,26 @@ EOF
   run --via dispatch --repo objectstack-ai/objectstack --actions "$dir/actions.json" -- true || rc=$?
   st_case '--actions AND a command is usage (2)' "$rc" "$EXIT_USAGE"
   # A cloud seat container, under auto, with a command: the ONE shared selector decides. With no
-  # OS_FLEET_SESSION the seat has not opted in, so it is direct — said out loud — and the command runs.
+  # session from EITHER source (OS_FLEET_SESSION blank, the container variable unset — this self-test
+  # runs inside cloud containers too, so the inherited one is dropped) it is direct — said out loud —
+  # and the command runs.
   : > "$err.cloud"
   rc=0
-  env -u GIT_DIR OS_FLEET_TOKEN_CACHE_FILE="$cache" OS_FLEET_APP_ID=1 OS_FLEET_INSTALLATION_ID=2 OS_PM_WRITE_PACE_FILE="$pace" HTTPS_PROXY= https_proxy= OS_FLEET_TRANSPORT= OS_FLEET_SESSION= \
+  env -u GIT_DIR -u CLAUDE_CODE_REMOTE_SESSION_ID OS_FLEET_TOKEN_CACHE_FILE="$cache" OS_FLEET_APP_ID=1 OS_FLEET_INSTALLATION_ID=2 OS_PM_WRITE_PACE_FILE="$pace" HTTPS_PROXY= https_proxy= OS_FLEET_TRANSPORT= OS_FLEET_SESSION= \
     CCR_AGENT_PROXY_ENABLED=1 bash "$SELF" --read -- sh -c 'printf "%s" "$GITHUB_TOKEN"' > "$dir/cloud.out" 2> "$err.cloud" || rc=$?
-  st_case 'a command under auto in a cloud container WITHOUT a session is direct (the seat has not opted in): it runs, and the line names OS_FLEET_SESSION' \
+  st_case 'a command under auto in a cloud container WITHOUT a session from either source is direct: it runs, and the line names OS_FLEET_SESSION' \
     "$rc|$(grep -c 'auto → direct' "$err.cloud")|$(grep -c 'OS_FLEET_SESSION' "$err.cloud")|$(cat "$dir/cloud.out")" "0|1|1|$token"
   cat "$err.cloud" >> "$err"
+  # …with NO OS_FLEET_SESSION but the container's own session variable (a cloud seat's default) and a live
+  # relay (stood in by the test override): the selector DERIVES the session, all three hold, so a command
+  # is refused with the relay spelling — the allowed command spelling routes through the relay with no prefix.
+  : > "$err.cloud"
+  rc=0
+  env -u GIT_DIR OS_FLEET_TOKEN_CACHE_FILE="$cache" OS_FLEET_APP_ID=1 OS_FLEET_INSTALLATION_ID=2 OS_PM_WRITE_PACE_FILE="$pace" HTTPS_PROXY= https_proxy= OS_FLEET_TRANSPORT= OS_FLEET_SESSION= \
+    CCR_AGENT_PROXY_ENABLED=1 CLAUDE_CODE_REMOTE_SESSION_ID=cse_01ABCDEFGHJKMNPQRSTVWXYZ OS_FLEET_RELAY_LIVE=1 bash "$SELF" --read -- sh -c 'printf "%s" "$GITHUB_TOKEN"' > "$dir/cloud.out" 2> "$err.cloud" || rc=$?
+  st_case 'a command under auto with the session DERIVED from the container (no OS_FLEET_SESSION) is REFUSED (3) with the relay spelling, the line naming the container variable, and no token reached it' \
+    "$rc|$(grep -c -- '--via dispatch' "$err.cloud")|$(grep -c 'CLAUDE_CODE_REMOTE_SESSION_ID' "$err.cloud")|$(cat "$dir/cloud.out")" '3|1|1|'
+  cat "$err.cloud" >> "$err"
   # …with a session AND a live relay (stood in by the test override): dispatch, so a command is refused with the relay spelling.
   : > "$err.cloud"
   rc=0
@@ -367,8 +381,9 @@ if [[ "$VIA" == dispatch ]]; then
   exit "$EXIT_USAGE"
 fi
 if [[ "$VIA" == auto ]]; then
-  # The ONE selector every tool shares decides: dispatch only when the cloud discriminator, a
-  # well-formed OS_FLEET_SESSION and a live relay all hold. Its JSON line is read, never re-derived.
+  # The ONE selector every tool shares decides: dispatch only when the cloud discriminator, the seat's
+  # session (from the container, OS_FLEET_SESSION overriding it) and a live relay all hold. Its JSON
+  # line is read, never re-derived.
   ROUTE_JSON="$(node "$HERE/fleet-write/dispatch.mjs" --route)" || {
     log "the transport selector refused (fleet-write/dispatch.mjs --route exit $?); nothing ran."
     exit 3