feat(docker): derive the agent image's npm CLI list from the catalogue

docker/agent.Dockerfile hardcoded the four npm-published CLIs it installs, one
of the several lists that had to be kept in step with the registry by hand.

It now takes them as `ARG CLI_NPM_PACKAGES`, supplied by
scripts/build-agent-image.mjs from config/clis.stock.json, with the default set
to today's list so a bare `docker build` still produces the same image. The arg
is expanded unquoted because word splitting is what turns the list into several
arguments, which is exactly why every token is validated against
^[@A-Za-z0-9][@A-Za-z0-9/._-]*$ on the producing side; a package name carrying a
space or a metacharacter is refused rather than reaching the RUN line. Verified
by building the layer: four packages in, four arguments out, and the default
still applies with no arg.

The list is filtered on each entry's `enabled` flag — the field whose absence
was the maintainer's §3 finding, where a CLI shipping disabled still got baked
into every image. No stock entry is disabled today, so that assertion would pass
vacuously; a unit test feeds the pure helper a fabricated disabled entry so the
fix is covered now rather than the first time someone ships one.

⚠️ It reads the STOCK catalogue, never the merged registry. A user's
~/.codeman/clis.json must not change what is inside an image tagged
codeman/agent:base, or two machines holding that tag hold different images.

Four CLIs keep hand-written layers because the registry cannot describe what
makes them special: pi's --ignore-scripts, deepseek's pnpm companion and dsh-tui
profile, and the three standalone installers. Rather than extend the schema for
a Docker-only benefit, the coverage test requires each to carry a written reason
AND still be present, so an exclusion cannot quietly become an omission.

There are two producers of this command line and there have to be — the .mjs
cannot import TypeScript, and src/docker-hosts.ts builds the same argv for the
in-app auto-build — so a parity test pins them together, package list, arg pairs
and rendered argv. Their order is pinned too: a different order is a different
RUN string and so a needless cache miss between the two build paths.

docker/server.Dockerfile is deliberately NOT edited (PRs #373 and #377 both
modify it); its narrower list is asserted as a declared omission list instead, so
the divergence is reviewable without touching the file.

Also fixes the in-app hint at index.html, which the new coverage test caught
still omitting omp.

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

scripts/build-agent-image.mjs

@@ -12,6 +12,7 @@
 import { spawn, spawnSync } from 'node:child_process';
 import { fileURLToPath } from 'node:url';
 import { dirname, join } from 'node:path';
+import { agentImageBuildArgPairs, readCatalog } from './lib/cli-catalog.mjs';
 
 const __dirname = dirname(fileURLToPath(import.meta.url));
 const REPO_ROOT = join(__dirname, '..');
@@ -58,6 +59,13 @@ if (args.help) {
 const engine = resolveEngine(args.engine);
 const buildArgs = ['build', '-f', DOCKERFILE, '-t', args.image];
 if (args.noCache) buildArgs.push('--no-cache');
+// The CLI list comes from the generated catalogue rather than the Dockerfile, so adding a
+// stock CLI needs no edit in either. `src/docker-hosts.ts` assembles the same argv for the
+// in-app auto-build; test/agent-image-build-args-parity.test.ts pins the two together, since
+// two independent producers of one command line is exactly how they drift.
+for (const [name, value] of agentImageBuildArgPairs(readCatalog())) {
+  buildArgs.push('--build-arg', `${name}=${value}`);
+}
 buildArgs.push(REPO_ROOT);
 
 console.log(`[build-agent-image] ${engine} ${buildArgs.join(' ')}`);