Make the eject summary name every retained command

Proposal (rationale)

The disposable Arena Lab canary run by WI-090 on 2026-09-06 printed, at the end of rungs eject, “Only check survives ejection; add, upgrade, render and the rest are gone until you re-adopt.” Two commands later the same canary ran node .ai/rungs.mjs hook instructions-shell-backticks against the ejected launcher and got the expected block. WI-086 retained hook in the launcher, the runner and the ejected README, and left this one sentence typed by hand in src/cli.ts. A summary that understates what survived is the kind of stated fact this tool claims to keep true.

Decision

accepted — 2026-09-06 under WI-085, as work discovered by WI-090’s canary. Derive the sentence from the retained list so it cannot drift again.

Plan

Requirements

The eject summary names every command in EJECTED_RETAINED, derived rather than typed.
The packed journey asserts the sentence names both check and hook.

Impacts

src/cli.ts (cmdEject), test/package.test.js.

Approach

Import EJECTED_RETAINED where the summary is printed and join it. Alternative: retype the sentence — rejected, since that is how it drifted.

Acceptance criteria / tests

The packed journey’s eject step asserts Only \check` and `hook` survive ejection`.
rungs check and the serial suite pass.

Out of scope

The check [path] [tier] versus check [tier] asymmetry between the CLI and the ejected launcher (F-063); nothing else deferred.

Execution

Branch feature/WI-092-eject-summary-retained-commands from 0a50515f, 2026-09-06. One commit, as planned; no deviation.

Review

node --test --test-concurrency=1 --test-name-pattern '^a packed candidate retrofits' test/package.test.js passes (1/1, 41 s, 2026-09-06) with the new assertion on the eject summary.
Serial suite NODE_OPTIONS=--max-old-space-size=2048 node --test --test-concurrency=1 test/*.test.js: 152 tests, 149 pass, 0 fail, 3 skipped, 158 s (2026-09-06). node src/cli.ts check: 31 pass.