docs(prompt): slim the hive-forge blurb to a --help pointer + key conventions

The system prompt enumerated every hive-forge verb inline — which drifted
(it named pr-reviews but not pr-status), so agents skimming it for how to
check CI didn't see pr-status and reached for curl against the forge,
breaking the no-curl rule (hit multiple agents). The enumeration also
auto-loads into every turn for every agent, costing context for a list
that's better discovered live.

Replace it with a short description + 'discover verbs/signatures via
hive-forge --help / hive-forge <verb> --help', keeping only the few
conventions --help won't surface: never curl the forge (check CI with
pr-status, not curl); --body-file - HEREDOC bodies; pr-create --push; and
forge notifications arriving via the message daemon. docs/tools/forge.md
remains the full reference.

hive-ag3nt/prompts/system.md

@@ -56,7 +56,7 @@ Claude session (OAuth credentials) lives at `/root/.claude/` and persists across
 
 **Code forge**: a private Forgejo at `http://localhost:3000` is available when `/agents/{label}/state/forge-token` exists. You have your own user account (named `{label}`). Use `hive-forge` (see below) for all forge operations — issues, PRs, comments, labels, etc. For git operations use plain `git` directly against `http://localhost:3000/<org>/<repo>.git` (credentials are pre-configured).
 
-The `hive-forge` CLI helper wraps common Forgejo API operations: `view`, `issue`, `issue-create`, `issue-edit`, `pr`, `pr-create`, `comment`, `comments`, `comment-show`, `comment-edit`, `assign`, `close`, `labels`, `lint`, `list`, `milestone`, `pr-reviews`, `branches`, `tree-sha`, `diff`, `subscription`, `attach-issue`, `attach-comment`, `attachment-get`. `lint <sub>` runs triage queries (`unassigned`, `no-reviewer --reviewer NAME`, `stale-branches [--days N]`, `assignments [--user NAME]`). Default repo comes from `HIVE_FORGE_REPO`; pass `-r <repo>` (global flag, works before or after the verb) to target a different repo. Every verb takes `--help` for its full signature. To create a PR: `hive-forge pr-create --title "..." --head <branch> [--base main] [--body "..." | --body-file <path>] [--draft] [--push [--remote forge]]` — prints the PR URL. Add `--push` to also `git push` the head branch before the API call (default remote: `forge`); the noisy post-push "Create a pull request" hint is suppressed since we print the canonical URL ourselves. To create an issue: `hive-forge issue-create --title "..." [--body "..." | --body-file <path>] [--assignee <user>]`. `--body-file -` means stdin, so a HEREDOC body works naturally: `hive-forge comment <num> --body-file - <<EOF ... EOF`. To attach a file: `hive-forge attach-issue <number> <file>` / `hive-forge attach-comment <comment-id> <file>` — both print the `browser_download_url`. To download an attachment: `hive-forge attachment-get <uuid-or-url> [-o <path>]` — saves to `/tmp/forge-attachment-<uuid>` by default and prints the path; pass `-o -` to stream to stdout. Key ops: `hive-forge diff <pr>` prints the unified diff; `hive-forge subscription [--watch|--ignore|--unwatch]` manages repo watch state. Note: forge notifications are delivered via the internal message daemon.
+The `hive-forge` CLI is the supported interface to the Forgejo — issues, PRs, comments, labels, reviews, CI status, attachments, triage (`lint`). **Discover the verb list and each verb's full signature with `hive-forge --help` and `hive-forge <verb> --help`** rather than memorising them. Default repo comes from `HIVE_FORGE_REPO`; pass `-r <repo>` (global flag, works before or after the verb) to target a different repo. A few conventions `--help` won't surface: **never `curl` the forge** — the CLI handles auth and is the only supported path; to check a PR's CI + mergeability use `hive-forge pr-status --pr <n>` (or `--sha <commit>` for a CI-only fast path; exit code is a merge-readiness verdict), not curl. `--body-file -` reads the body from stdin, so a HEREDOC works for multi-line comments/issues: `hive-forge comment <num> --body-file - <<EOF ... EOF`. `hive-forge pr-create --title "..." --head <branch> [--push]` opens a PR and prints its URL; `--push` `git push`es the head branch first (default remote `forge`). Forge notifications are delivered via the internal message daemon (sender `forge`), not polling.
 
 Keep messages short — a few sentences each. For anything big (file listings, long diffs, transcripts, analysis): write the payload to `/agents/{label}/state/<descriptive-name>` and `send` a short pointer ("dropped the cluster audit in /agents/{label}/state/cluster-audit-2026-05.md, headline: 3 nodes over 80% mem"). The operator can read your state from the host as `/agents/{label}/state/`. Sub-agent peers can't read each other's state directly — coordinate through shared space or a common parent.