ci: disable Claude Code Review workflow

[l1a]

What

Turns off the Claude Code Review GitHub Actions workflow for pull requests:

• the pull_request trigger (opened, synchronize, ready_for_review, reopened) is commented out and replaced with workflow_dispatch, so the workflow still exists and can be started by hand;
• the claude-review job additionally carries if: false, so even a manual dispatch is a no-op until that guard is removed.

Two independent switches rather than one, so re-enabling is a deliberate act and neither half can silently turn the review back on.

Why

The automated review ran on every PR and every subsequent push, adding a required-looking check and API cost without changing review outcomes on this repo — the just pr gate plus the 15-job CI matrix already cover the ground it was reporting on. Disabling in place (rather than deleting the file) keeps the wiring intact for a future opt-in.

Also in this PR

Standard per-PR hygiene from AGENTS.md §4:

• retch-cli 0.6.16 → 0.6.17 (patch), Cargo.lock refreshed via cargo check
• docs/retch.1 regenerated with just man (version footer only — one line)
• NOTES.md Current State header bumped and a release-log entry added

Release note for tagging: v0.6.16 was tagged at 622cf3b (#184), but #185 and #186 merged afterwards with Cargo.toml still reading 0.6.16. So v0.6.17 rolls up three changes — #185 (portable Justfile recipes), #186 (logo height / audio normalisation / line wrapping) and this chore — and it is a two-crate publish, since retch-sysinfo 0.1.52 is not on crates.io yet (the index has 0.1.51).

Skipped deliberately, each a legitimate no-op for a CI-only change: README.md (no user-visible flag, config key, or feature), the GitHub wiki (all 8 pages checked — none documents the workflow list), and docs/retch.md / tldr (no CLI flags changed).

Test plan

• just pr gate green end to end: version-bump check, NOTES.md header check, just man regen matches the committed page, cargo check leaves Cargo.lock clean
• just check — cargo fmt --check, cargo clippy --workspace -- -D warnings, and cargo clippy --features graphics -- -D warnings
• cargo test --workspace — 59 cli + 15 integration + 115 sysinfo, all green
• cargo audit — no new advisories (only the pre-existing allowed paste RUSTSEC-2024-0436 unmaintained warning)
• claude-code-review.yml parses as YAML, exposes exactly one trigger (workflow_dispatch), and its claude-review job resolves if: false
• No claude-review check appears on this PR — the point of the change; verified on this PR: gh pr checks 187 lists 17 checks (CodeQL x3, audit, aur, 7x build, graphics-feature, full-test/build-release/release/nixpkgs skipping) and zero claude-review entries
• Manual dispatch remains available once merged (gh workflow run "Claude Code Review" is registered on the default branch) — cannot be verified pre-merge, since workflow_dispatch is only offered from the default branch's copy of the file