The action hook resolves project/type when its callers have none, so arrange stops refusing hand-started seats (#1137)

[fujibee]

Fixes #1137.

send.sh/inbox.sh/history.sh call agmsg_self_name_on_action with only <team> <agent> — they never had a project or type to pass, not merely forgot to (verified: neither variable exists anywhere in any of the three files). The hook forwarded that straight through to the placement-record writer, so a record written by acting — the #1109 path, the one that exists for hand-started seats — carried two empty fields. arrange.sh requires both and refuses such a record outright with "missing project or type"; the issue measured 12 of 36 placement records stuck this way on one live machine, including seats in daily use.

Coordination note

scripts/lib/self-name.sh (the action-hook path this fixes) is the exact layer #1152/#1157 (feat/1152-self-write, still open) plans to remove and replace. Cross-checked with the #1157 author before starting: their new writer (agmsg_self_write) already requires project/type as non-optional and has its own test for that; this fix is scoped to the current, still-live path only, and does not touch anything #1157 changes (no file overlap — confirmed by running the full affected suites, listed below). They're dropping Closes #1137 from #1157's body so the two don't race to close the same issue.

Fix

Resolve project/type inside agmsg_self_name_on_action itself, the same way whoami.sh already answers the identical question (agmsg_detect_cli_type, agmsg_resolve_project), instead of threading two new arguments through three callers that have no better source for them than this process's own cwd and type anyway. Only when the caller did not already supply them, and only right before the slow-half write — the common fast-path short-circuit (the cheap case this hook is designed around) is untouched. Best-effort, matching every other lazy source in this function: a resolution failure leaves the field empty exactly as before, never blocks the naming this hook exists to do.

Verification

• tests/test_self_name.bats gains the failing-side control the day's standard calls for: a hand-started seat's action-hook record now carries non-empty project/type — verified red by reverting the fix and re-running (project empty, assertion fails) — and a caller that already supplies both explicitly is never second-guessed (its exact values pass through unchanged).
• Full file re-run after restoring the fix: test_self_name.bats 25/25, test_dispatch.bats 15/15, test_delivery.bats 198/198, test_terminal_registry.bats 166/166 — all clean.
• check-enforced-assertions.sh: 626/626, baseline unchanged.
• bash -n scripts/lib/self-name.sh: OK.

Base: integration/terminal-driver-v1 tip at branch time (026d10f4).