webcmd web fetch is invisible to --help, list, completions, and -h despite always being available #252

What happens

webcmd web fetch always works — it is intercepted on the client-owned fast path in src/main.ts:79 before adapter discovery and before the hosted-mode branch, so it runs on a fresh install with zero plugins and in hosted mode. But nothing in the CLI's own surface says it exists.

On current main (0.5.4 build), with the web plugin not installed:

$ webcmd --help            # no `web` under Commands or Site adapters
$ webcmd list              # no web fetch
$ webcmd list -f json      # 0 entries with "site": "web"
$ webcmd --get-completions webcmd web
                           # (empty)
$ webcmd web fetch --help
ArgumentError: --url must be an http or https URL
    at clientOptions (…/dist/src/fetch/command.js:34:15)

hosted-contract.json has web/fetch-browser but no web/fetch entry either.

Meanwhile the command is fully functional:

$ webcmd web fetch --url https://example.com
# Example Domain
…

Why this happens

There are two registration paths for the same command and only one of them feeds discovery:

• src/main.ts:79-82 — the fast path. Hardcoded argv[0] === 'web' && argv[1] === 'fetch', hand-rolled argv parsing in clientOptions(). Always available. Never touches commander, so it contributes nothing to help, list, cli-manifest.json, or completions, and has no -h.
• plugins/web/fetch.js — a one-line side-effect import (import '@agentrhq/webcmd/fetch/command') that registers webFetchCommand from src/fetch/command.ts:5 in the registry. This is what makes the command visible — but only for users who have installed the web plugin.

So availability and discoverability are decoupled: the command works for everyone, and is listed only for the subset who installed a plugin they did not need in order to use it.

Why it matters

web fetch is the first call skills/smart-search/SKILL.md mandates, and the skill ships in the npm package (files includes skills/**). An agent that follows the documented practice of reading live command metadata before executing — webcmd list -f json, webcmd <site> <command> -h, exactly what smart-search instructs elsewhere — will conclude the command does not exist, or will try -h and get a stack trace telling it --url is required.

The --help output also advertises Run 'webcmd list' for full command details, which is inaccurate for this command.

Related but distinct: #247 is the mirror-image asymmetry (fetch-browser is listed in the hosted contract but not installed by default). #246 covers the stack-trace formatting on the fast path — this issue is that -h is not a supported argument at all, not that its failure prints badly.

Suggested fix

Register the web site in the built-in program so web fetch appears in --help, list, cli-manifest.json, and completions without a plugin install, and so webcmd web fetch -h prints real help.

Keep the src/main.ts fast path as-is. The comment above it is explicit that hosted mode must not read ~/.webcmd/clis or local site memory just to decide what commands exist, and the fast path is what guarantees web fetch stays client-owned in hosted mode. The two paths should stay separate; only the discovery side needs adding.

Two follow-ons if this lands:

• Decide whether web/fetch belongs in hosted-contract.json. It is client-owned, so it may warrant an explicit availability mode rather than a plain entry — npm run check:hosted-contract will need to agree either way.
• Once help is real, clientOptions() and the cli({...}) arg spec in src/fetch/command.ts are two hand-maintained copies of the same flags (--url --timeout --max-chars --allow-private). Worth collapsing so help cannot drift from what the fast path actually parses.