fix(init): point the install trailer at the Taskless skill only

[theCodeDrift]

After a successful install, taskless init (and the wizard) printed a trailer that branched on whether the /tskl command was installed, and in both forms told the user to run /tskl onboard and/or a pinned npx @taskless/cli-nightly@… onboard from the terminal. That is more than the user needs and leaks a version-pinned command into the first thing they read.

The trailer is now a single line for every install plan:

In your AI tool, you can use the Taskless skill now - just ask to onboard with Taskless to set up starter rules for your codebase and get a report of what Taskless can catch.

• getOnboardTrailer() takes no arguments; init and the wizard stop computing commandsInstalled for it (the init --json field is unchanged).
• cli-init spec: the trailer requirement and its scenarios now describe the single skill-only line.
• Tests assert the new line, and that it mentions neither /tskl onboard nor a CLI onboard command.
• Patch changeset added.

[theCodeDrift]

@claude /review

[github-actions]

Claude finished @theCodeDrift's task in 1m 3s —— View job

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Review: fix(init): point the install trailer at the Taskless skill only

Review mode: incremental — read 0 prior review thread(s) before reviewing. .prior-review.json contains no prior inline threads, review summaries, or top-level comments beyond the trigger itself, so this is the first review of this PR.

Summary: Clean, well-scoped change. getOnboardTrailer() drops its commandsInstalled argument and returns a single fixed string; both call sites (init.ts, wizard/index.ts) are updated; the cli-init spec delta correctly restates the full requirement text (not just the diff) along with both scenarios; tests assert the new wording and the absence of /tskl onboard and the pinned onboard command; a patch changeset is included.

Checked for issues that often accompany this kind of change:

• commandsInstalled is still computed and exposed on the init --json envelope (init.ts:114,389,476) — correctly left alone per the PR description, only the trailer-building usage was removed.
• getCliPrefix import is still used elsewhere in both onboard.ts (line 93) and wizard/index.ts (lines 68, 99, 153), so no dead import was left behind.
• No other call sites, docs, or wizard tests reference the old /tskl onboard / Next: wording or the removed commandsInstalled parameter — grepped across packages/cli/src and packages/cli/test.
• The spec delta is a full restatement of the requirement (not a partial patch), consistent with the "MODIFIED Requirements replace, not patch" convention in this repo's CLAUDE.md, and both new scenarios read correctly against the new behavior.
• New trailer string matches all updated test regexes (^In your AI tool, .*Taskless skill, ask to onboard with Taskless) and doesn't match the negative assertions (/tskl onboard, @taskless/cli@latest onboard).

No new findings. Nothing from a prior review to carry forward, since there wasn't one.