hive-forge: add dependency verb for issue/pr blocking relationships

docs/tools/forge.md

@@ -21,7 +21,7 @@ under `issue` and `pr` parent commands — `hive-forge pr close 42`,
 refuses an issue number, which the old generic `close` couldn't). Run
 `hive-forge pr --help` / `hive-forge issue --help` for the full subcommand
 list (show/create/edit/status/merge/reviews/commits/diff/view/comment/
-comments/close/reopen/labels/assign/timeline as applicable).
+comments/close/reopen/labels/assign/dependency/timeline as applicable).
 
 The flat forms below (`close 42`, `pr-create …`, `pr-status …`, …) still work
 as **hidden back-compat aliases** during the transition and are dropped from
@@ -49,6 +49,10 @@ hive-forge comment-edit 18042 --body "..."  # edit a comment
 hive-forge assign 42 damocles
 hive-forge close 42
 hive-forge labels 42 add feature
+hive-forge issue dependency 42                # list #42's dependencies (issues it's blocked by)
+hive-forge issue dependency 42 add 40 41      # #42 is now blocked by #40 and #41
+hive-forge issue dependency 42 remove 40      # drop the #40 dependency link
+hive-forge pr dependency 55 add 42            # same verb, PR-scoped (Forgejo shares the issue/PR index)
 hive-forge issue-create --title "..." --body "..."
 hive-forge issue-create --title "..." --body "..." --label area/ops --label type/bug  # repeatable
 hive-forge issue-edit 42 --title "new title"
@@ -273,6 +277,13 @@ to discover valid label names before triaging or to audit the label set.
 <name>` (directly). `--workflow <file>` picks the workflow file for
   `--pr` / `--branch` (default `ci.yml`). Dispatch re-runs the whole
   workflow — there is no single-job variant.
+- `issue dependency <n> add <dep...>` / `pr dependency <n> add <dep...>`
+  set "blocked by" links via Forgejo's dependency feature — the
+  operator's preferred way to track blocking relationships over labels
+  (labels can go stale; dependencies are structured and show in the
+  forge UI's dependency panel). Same-repo only, matching the web UI (no
+  cross-repo dependency support). `list` (the default action) and `add`/
+  `remove` all print the resulting dependency list as JSON.
 - Do NOT use raw `curl` for forge access -- the CLI handles auth,
   error checking, and output formatting.
 - `issue-create --label <name>` / `pr-create --label <name>` are