docs: add lint verb and approval cancel_loose_end (follow-up to #507 #508)

CLAUDE.md

@@ -170,7 +170,7 @@ hive-forge/        Forgejo CLI wrapper (`hive-forge` binary)
                          issue-edit, pr-create, pr-reviews, assign,
                          close, labels, milestone, branches,
                          tree-sha, diff, subscription, attach-issue,
-                         attach-comment). Replaces the 600-line
+                         attach-comment, lint). Replaces the 600-line
                          hive-forge-tools.nix bash script (closes #280).
 
 hive-sh4re/        wire types (HostRequest/Response, AgentRequest/Response,

docs/gotchas.md

@@ -137,6 +137,10 @@ hive-forge diff 42                          # unified diff (lockfile hunks colla
 hive-forge diff 42 --full                   # include unfiltered lockfile hunks
 hive-forge branches deployed/               # filter branches by pattern
 hive-forge -r other-org/other-repo pr 7     # target a different repo
+hive-forge lint unassigned                  # open issues/PRs with no assignee
+hive-forge lint no-reviewer --reviewer argus  # PRs missing a reviewer comment from argus
+hive-forge lint stale-branches --days 14    # branches with no recent activity
+hive-forge lint assignments                 # per-assignee open item count
 ```
 
 `hive-forge <verb> --help` prints the full signature for any verb.

docs/turn-loop.md

@@ -212,9 +212,10 @@ it as a stdio child via `--mcp-config`. The hyperhive socket name is
   reminders it scheduled. Each row carries an id + kind for
   `cancel_loose_end`.
 - `cancel_loose_end(kind, id)` — withdraw a `question`
-  (posts `[cancelled by <self>]` to unblock the asker) or a
-  `reminder` (hard-delete before fire). Sub-agents may only
-  cancel rows they own.
+  (posts `[cancelled by <self>]` to unblock the asker), a
+  `reminder` (hard-delete before fire), or (manager only) an
+  `approval` (transitions to `Cancelled`; sub-agents refused with a
+  clear error). Sub-agents may only cancel rows they own.
 - `remind(message, due)` — schedule a reminder that lands in
   this agent's own inbox at a future time (sender shows as
   `reminder`). Large payloads spill to