feat(claude-code): update placemat for Claude Code v2.1.287

[dommango]

What this changes

Syncs the Claude Code placemat from v2.1.286 to v2.1.287 (no releases in between). This release ships the new "Mods" feature (plugins that can modify deeper Claude Code behavior); adds the new rows and notes below, each sourced from the vendor docs or changelog directly (not from a sibling placemat).

New rows:

• /plugin-authoring (Skills & Agents card) — confirmed directly in commands.md's own reference table ("Requires Claude Code v2.1.287 or later")
• allowManagedModsOnly (Settings → Managed & Enterprise) — confirmed verbatim on the new docs/en/plugins/mods/overview page; not yet in settings-reference.md (same "changelog/docs-page first" pattern as several existing rows)
• bareElicitationCapability (Hooks → MCP Servers) — confirmed via the v2.1.287 changelog; not yet in mcp.md
• CLAUDE_AX_PREPARK_MS (Env Vars) — confirmed via the v2.1.287 changelog

Notes added to existing rows:

• CLAUDE_CODE_DISABLE_1M_CONTEXT — Opus 4.7+ and Fable now default to a 1M context window with no [1m] suffix
• alwaysLoad (MCP server config) — set explicitly to false to defer all of that server's tools behind tool search

Updated changelog.html (new October 2026 month-group with the v2.1.287 entries; September 2026 group collapsed), the release-tag/print-head pair, the footer sync date (2026-10-01, matching the changelog's release date), and regenerated changes.json/feed.xml. Re-extracted sources.json → inventory and bumped inventory.fetched to 2026-10-01 per the new rows added.

Type

• Content correction (wrong/outdated/missing entry)

Checklist

• I read AGENTS.md's Style Guide and Content Rules
• node tests/placemat.test.js claude-code passes locally (54/54)
• node scripts/build-changes.js --all --check passes locally (generated files are fresh)
• No versions/*.html files were edited
• No hand-edited changes.json or feed.xml — both regenerated via the build script
• Every new/changed row is sourced from Claude Code's own vendor docs or changelog — verified directly against code.claude.com/docs/en/commands, /plugins/mods/overview, and the official changelog, never copied from a sibling placemat
• Nothing here required class="unverified" — all new rows are confirmed via a vendor source
• New rows have an id="i-<slug>" and a matching .row-link permalink
• Only the claude-code/ directory is touched

Source

• https://code.claude.com/docs/en/changelog (v2.1.287, 2026-10-01)
• https://code.claude.com/docs/en/commands (confirms /plugin-authoring)
• https://code.claude.com/docs/en/plugins/mods/overview (confirms allowManagedModsOnly and the Mods feature)
• https://registry.npmjs.org/@anthropic-ai/claude-code (version poll)

🤖 Generated with Claude Code

https://claude.ai/code/session_01GJePY3Wjnu7Mcyoog4mAMV

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Generated by Claude Code

[dommango]

Merge-gate code review

Ran the code-review skill against this PR's diff (claude-code/index.html, claude-code/changelog.html, claude-code/sources.json; changes.json/feed.xml skipped as generator output), independent of the pipeline's own self-review step.

Verdict: clean — no CRITICAL/HIGH findings.

Checked:

• Every new/changed claim (/plugin-authoring, allowManagedModsOnly, bareElicitationCapability, CLAUDE_AX_PREPARK_MS, the CLAUDE_CODE_DISABLE_1M_CONTEXT and alwaysLoad notes) against the live vendor pages (commands.md, the new plugins/mods/overview page, and the official changelog) — all matched, correctly placed by card, and correctly tagged as verified vs. unverified.
• Row-id permalink stability — no existing i- id was changed.
• Structural test suite: 54/54 passing locally.

No CRITICAL/HIGH finding → proceeding to merge once CI is green, per the pipeline's merge gate.

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Generated by Claude Code