Document the Dispatch plugin in the in-app docs (docs audit)

[selfcontained]

Nightly docs audit. Slice: the deep-dive area carried in next_focus — the official Dispatch plugin (#952), which shipped with a README section and no in-app docs coverage at all.

The diff since the last audited SHA (037f4601..HEAD) was three PRs, all of which were either the previous audit's own docs work or dead-code deletion, so nothing was diff-driven this run.

What changed

• New docs-pane section "Plugin" (docs-sections/plugin.tsx) — trust first (unsigned/unsandboxed, ships no executable components, claude plugin details as the verification), then the two-step marketplace + install flow on both Claude Code and Codex, the eleven skills and the situation each fires on, and update mechanics (auto-update off by default on Claude Code; Codex has no update subcommand so upgrading means re-running codex plugin add).
• Ambient tip dispatch-plugin → plugin#plugin-install, since: 0.34.1. The plugin commit (fe8a46ba) is not an ancestor of Release v0.34.0; the nearest release after it is v0.34.1.
• README skill enumeration named 8 skills where plugins/dispatch/skills/ has 11 — personas, personalities and ui-validation were missing. Same fix in plugins/dispatch/README.md's intro paragraph (its own table below was already correct).
• README docs index listed the in-app sections as a set that was missing browser feedback, service resources and the new plugin section, and said "jobs" where the section is templates and jobs.

Validation

pnpm run format:write, pnpm run check, apps/web tips unit tests, and a Playwright render of /settings/help/plugin on an isolated dev stack (nav entry present, section renders, 0 console errors).

Deferred to next run

• next_focus → audit docs-pane Automations (templates & jobs) against apps/web/src/components/app/automations-* and apps/server/src/jobs/ — it has three open backlog items (defaultArgs has no UI, the vestigial "Show in command palette" toggle, JobNotifyConfig) and hasn't been deep-dived.
• New backlog item: the plugin manifests' description field (both .claude-plugin/plugin.json and .codex-plugin/plugin.json, plus .claude-plugin/marketplace.json) still names the same 8 skills. Left alone here because those strings are published marketplace metadata and changing them is a version-bump call, not a docs fix.