feat(gateway): add unclaim verb

Choreographer remediate strings already pointed agents at unclaim;
the verb didn't exist. Now it does — claimed/in_progress -> pending,
clears assigned_to, available to dev/qa/doc/cell_pm/main_pm.

agents/prompts/roles/cell_pm.md

@@ -27,6 +27,7 @@ You merge what your developers submit (leaf PRs into your cell branch via `compl
 | `complete(task_id, notes)` | Review a SUBTASK in `awaiting_pm_review`; auto-merges the leaf PR into your cell branch. | All descendants of the subtask terminal; PR open and mergeable. |
 | `submit_up(task_id, notes)` | Open your cell-level PR up to Main PM's branch; transition YOUR task to `awaiting_pm_review`. | All your subtasks terminal; `notes` >= 20 chars; journal `decision` recorded. |
 | `escalate_up(task_id, reason)` | Escalate to Main PM. | Task is yours or assigned to your cell. |
+| `unclaim(task_id)` | Release this claim back to pending. Use sparingly — your work-in-progress branch survives but the task is unassigned. | Task assigned to you and in claimed/in_progress. |
 | `note(text, scope?, task_id?)` | Journal. Required: `scope='decision'` before `i_will_plan` / `delegate` / `unblock` / `complete` / `submit_up` / `escalate_up`. | None. |
 | `say(channel, text)` / `dm(recipient, text)` | Channel post / DM. Channel slug without `#` (e.g. `"backend-cell"`). | None. |
 | `evidence(task_id)` | Inspect a task's PR + commits + diff. | None. |

agents/prompts/roles/developer.md

@@ -24,6 +24,7 @@ You write code; you do not coordinate. If you find yourself thinking "let me als
 | `submit_for_qa(task_id)` | Push your branch and open a PR. Run after your last commit, before `i_am_done`. | Task assigned to you; at least one commit; no PR yet. |
 | `i_am_done(notes)` | Strict submit for QA. Requires PR already open — run `submit_for_qa` first. | Self-verified; at least one commit; PR open; progress entry; journal `reflect`; every acceptance criterion addressed. |
 | `i_am_blocked(reason)` | Records the blocker, escalates to your PM, idles you. | Task is yours and active. |
+| `unclaim(task_id)` | Release this claim back to pending. Use sparingly — your work-in-progress branch survives but the task is unassigned. | Task assigned to you and in claimed/in_progress. |
 | `note(text, scope?)` | Journal entry (`scope ∈ note|decision|reflect|learning|struggle`). | None. |
 | `say(channel, text)` / `dm(recipient, text, skill?)` | Channel post / direct message. | Channel slug without `#`. |
 | `evidence(task_id)` | Fetches PR diff, commits, files changed, dev summary. | None. |

agents/prompts/roles/documenter.md

@@ -21,6 +21,7 @@ You do NOT re-implement the developer's work. You do NOT review or critique the
 | `claim_doc_task(task_id)` | Claims the doc task; returns PR data inline. | Task in `awaiting_documentation`; you are not the original developer. |
 | `commit(message)` | Commits doc changes on the task branch (auto-prefixed `[task-id]`). | Task in `in_progress`; on the task branch. |
 | `i_documented(task_id, notes, files)` | Marks docs complete; transitions toward `awaiting_pm_review`. | At least one doc file in `files`; `notes` >= 20 chars. |
+| `unclaim(task_id)` | Release this claim back to pending. Use sparingly — your work-in-progress branch survives but the task is unassigned. | Task assigned to you and in claimed/in_progress. |
 | `note(text, scope?)` | Journal entry. | None. |
 | `say(channel, text)` / `dm(recipient, text, skill?)` | Channel post / direct message. | Channel slug without `#`. |
 | `evidence(task_id)` | Re-fetches PR diff and commits if needed. | None. |

agents/prompts/roles/main_pm.md

@@ -27,6 +27,7 @@ You merge what your Cell PMs submit (cell PRs into your root branch via `complet
 | `complete(task_id, notes)` | For a cell-PM task in `awaiting_pm_review`: merges the cell PR into your root branch. For YOUR root once all cell-PM subtasks are terminal: opens master PR + transitions root to `awaiting_ceo_approval`. | All descendants terminal; journal `decision` recorded. |
 | `escalate_up(task_id, reason)` | Escalate a stuck task up your chain to CEO. | Task is yours or assigned to a cell under your scope. |
 | `escalate_to_ceo(task_id, reason)` | Escalate a root task to CEO directly (only valid in `awaiting_pm_review`). | Root task in `awaiting_pm_review`; `pr_number` set. |
+| `unclaim(task_id)` | Release this claim back to pending. Use sparingly — your work-in-progress branch survives but the task is unassigned. | Task assigned to you and in claimed/in_progress. |
 | `note(text, scope?, task_id?)` | Journal. Required: `scope='decision'` before `i_will_plan` / `delegate` / `complete` / `escalate_*`. | None. |
 | `say(channel, text)` / `dm(recipient, text)` | Channel post / DM. Channel slug without `#` (e.g. `"main-pm-board"`). | None. |
 | `evidence(task_id)` | Inspect a task's PR + commits + diff. | None. |

agents/prompts/roles/qa.md

@@ -20,6 +20,7 @@ A pass without evidence is a betrayal of your role: the entire downstream chain
 | `claim_review(task_id)` | Claims the QA task; returns PR data inline. | Task in `awaiting_qa`; you are not the original developer. |
 | `pass(task_id, notes)` | Accepts the work; transitions to `awaiting_documentation`. | Task claimed by you; `notes` >= 80 chars; journal `learning` entry recorded. |
 | `fail(task_id, issues)` | Rejects with concrete actionable issues; transitions to `needs_revision`. | Task claimed by you; each issue references criterion/file/line. |
+| `unclaim(task_id)` | Release this claim back to pending. Use sparingly — your work-in-progress branch survives but the task is unassigned. | Task assigned to you and in claimed/in_progress. |
 | `note(text, scope?)` | Journal entry. Required: `scope='learning'` before `pass`/`fail`. | None. |
 | `say(channel, text)` / `dm(recipient, text, skill?)` | Channel post / direct message. | Channel slug without `#`. |
 | `evidence(task_id)` | Re-fetches full PR diff and commits if you need more detail. | None. |