refactor(install): drive CLI detection, the install menu and hints from the catalogue

install.sh carried nine search-path arrays, eighteen near-identical
check_<cli>/get_<cli>_path functions, and three separately hand-maintained
enumerations of all nine CLIs. They had to agree and did not: upstream b6d0f1fa
is "wire OMP into install.sh's CLI detection (it had none)", and the section
comment above the roll-call named six of the nine.

All of it now reads the generated catalogue. `detect_all_clis` resolves every
CLI in one memoized pass into CLI_FOUND_PATH/CLI_FOUND_COUNT; `check_cli` and
`get_cli_path` replace the eighteen pairs; the roll-call, the "no AI CLI found"
gate and the closing reminder become loops. Probe order per CLI is unchanged and
`test/install-sh-detection-parity.test.ts` proves it against the literals
transcribed from the arrays this deletes.

Behaviour changes worth naming:

- The install menu is built from the catalogue, so it offers every enabled CLI
  that is not installed and ships a command — five instead of two. Gemini had a
  command in the registry and appeared in NO list in this script.
- Its labels are now the registry's ("Claude" rather than "Claude Code"), the
  same trade PR A made for `codeman doctor` rows. A suffix map would just be the
  hand-maintained list again.
- On a wget-only host the menu prints commands instead of running them. The
  registry's commands call curl, whereas the two literals this replaces went
  through download_to_stdout; rewriting curl to wget inside a string we are
  about to execute is the wrong instinct.

The trust boundary is mechanical, not a promise: CLI_INSTALL_CMD_TRUSTED is
written only from the generated per-platform arrays and is the only thing ever
executed; CLI_INSTALL_CMD_DISPLAY is what the optional, opt-in refresh may
rewrite. The refresh warns on all three failure shapes — empty body, unparseable
content, failed fetch — which is the silent-degradation bug from the review, and
it parses with node into tab-separated records read by `read`, never eval.

Bash 3.2 throughout (macOS ships it): parallel indexed arrays, offset/length
windows instead of delimiters, no associative arrays, namerefs, mapfile or
here-strings. Verified by executing the script under a real bash 3.2 container,
which is also now a CI step alongside `bash -n` and a catalogue `--check` — the
empty-window case (`shell` has no binaries) is a runtime `set -u` abort that
`bash -n` cannot see. Running it that way caught `detect_os` being called inside
the platform loop: ten forks, and ten copies of one error, since a `die` inside
`$( )` can only exit the subshell.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_015EMxQreQUZX5ZyybxAGh12

.github/workflows/ci.yml

@@ -37,6 +37,35 @@ jobs:
       - name: Format check
         run: npm run format:check
 
+      # install.sh reaches users through `curl | bash` with nothing between it and
+      # them, and until now nothing in this repo checked it at all: no shellcheck,
+      # no bats, and the vitest gate is Node-only.
+      - name: install.sh syntax
+        run: bash -n install.sh
+
+      # macOS ships bash 3.2 and this runner has bash 5, so the constructs that
+      # actually break a Mac install are invisible here without a container. This
+      # step is what catches them — in particular expanding an EMPTY array under
+      # `set -u`, which bash 3.2 treats as an unbound variable and `bash -n`
+      # cannot see because it is a runtime error, not a syntax one.
+      - name: install.sh runs on bash 3.2 (macOS's version)
+        run: |
+          set -euo pipefail
+          docker run --rm -v "$PWD":/w -w /w bash:3.2 bash -n /w/install.sh
+          docker run --rm -v "$PWD":/w -w /w -e CODEMAN_INSTALL_SH_LIB=1 bash:3.2 bash -c '
+            set -euo pipefail
+            . /w/install.sh
+            detect_all_clis
+            # `shell` declares no binaries, so its offset/length window is length 0.
+            # Iterating it is the empty-array case; reaching here means it did not abort.
+            echo "bash $BASH_VERSION: ${#CLI_IDS[@]} CLIs, $CLI_FOUND_COUNT found"
+            cli_catalog_names >/dev/null
+            cli_catalog_print_install_hints >/dev/null
+          '
+
+      - name: CLI catalogue artifacts are in sync with stock.ts
+        run: npm run generate:cli-catalog -- --check
+
       - name: Server boot smoke test
         run: |
           set -u