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* feat(runtime): teach agents the parent/sub-issue protocol (MUL-2338) Adds a Parent / Sub-issue Protocol section to the runtime brief built by `buildMetaSkillContent`, emitted whenever the agent is running on a real Multica issue (assignment- or comment-triggered). Two behaviors are now documented for every issue-bound agent: - A. When wrapping up a child issue, post the final result and switch to `in_review` on this issue first, then post a single top-level comment on the parent. Mention the parent assignee only when it is another agent on a still-open parent — never self-mention, never @ member / squad, never re-trigger a `done` / `cancelled` parent. - B. When creating sub-issues, choose `--status backlog` for sub-issues that must wait and `--status todo` for the one to start immediately; promote with `multica issue status <id> todo` when its turn comes. The signal is explicitly framed as best-effort — no server-side state sync, no claim of a guaranteed handshake. The section is skipped for chat, quick-create, and run-only autopilot runs, which have no parent/child semantics. Tests in runtime_config_test.go assert that the section is present in both issue workflows, absent in the three non-issue modes, and that the wording does not introduce a non-existent `multica issue list --parent` command or promise a reliable handshake. Co-authored-by: multica-agent <github@multica.ai> * fix(runtime): split Step A of parent/sub-issue protocol by trigger type (MUL-2338) Comment-triggered runs were inheriting an unconditional `multica issue status <this-issue-id> in_review` from Step A, which conflicts with the comment-triggered workflow rule "Do NOT change the issue status unless the comment explicitly asks for it" (Elon's blocking review on PR #2918). Step A now branches on trigger type: - Assignment-triggered: keep "post final results + flip in_review". - Comment-triggered: complete the reply per the existing workflow rule, only flip status when the triggering comment asked for it, and gate the parent-notification steps on actually closing out child work. Tests lock the boundary: comment-triggered briefs must not contain the unconditional in_review command, must echo the existing status guardrail inside Step A, and must spell out the "closing out" gate. Assignment-triggered briefs still carry the unconditional flip. Co-authored-by: multica-agent <github@multica.ai> * fix(runtime): simplify parent/sub-issue mention rule to always @ parent assignee (MUL-2338) Per Bohan's directive on PR #2918: the per-case mention table (same agent / member / squad / closed parent) is overkill prompt complexity. Replace it with a single rule: always @mention the parent's assignee using the URL that matches assignee_type. The platform's existing run dedup handles re-triggers, and a single rule is easier for agents to follow predictably. Preserves the existing comment-triggered boundary (Step A still does NOT add an unconditional in_review flip on comment-triggered runs). Co-authored-by: multica-agent <github@multica.ai> * refactor(runtime): compress parent/sub-issue protocol to 3-rule convention (MUL-2338) Drop the spec-flavored A/B sub-headings and per-case mention table; keep three numbered rules (close out child, notify parent, pick backlog vs todo) plus a one-line best-effort preamble. The comment-triggered branch still re-asserts the "do not change status unless asked" guardrail and gates parent notification on actually closing out child work; the assignment-triggered branch still flips to `in_review`. Section is now 7 lines instead of 29. A new TestParentSubIssueProtocolIsCompact guards the ≤10-line ceiling so this stays a convention, not a spec. Co-authored-by: multica-agent <github@multica.ai> * fix(runtime): make sub-issue creation rule unconditional in parent/sub-issue protocol (MUL-2338) Elon's review on PR #2918: the preamble previously gated all three rules on the current issue having `parent_issue_id`, but rule 3 (creating sub-issues) needs to reach top-level parents that have no parent themselves — that is exactly where the `todo` vs `backlog` decision matters most. Move the gate from the preamble onto rules 1 and 2 per-rule; rule 3 now applies to any issue-bound run. Section stays at 7 newlines (≤10). Co-authored-by: multica-agent <github@multica.ai> * refactor(runtime): unify parent/sub-issue protocol as mechanism description (MUL-2338) Drop the if/else split between assignment- and comment-triggered runs in the Parent / Sub-issue Protocol section: both runs now read the same two-rule description of how the parent/child mechanism works. The comment-triggered workflow rule "Do NOT change the issue status unless the comment explicitly asks for it" naturally short-circuits the parent notification (no status flip → not closing out the child → skip), so the protocol no longer needs to branch on TriggerCommentID. Tests collapse the two trigger-specific cases into one parameterized test, and the assignment vs comment status-flip invariants are now anchored on the real workflow command (with substituted issue id) instead of the protocol's removed `<this-issue-id>` placeholder. Co-authored-by: multica-agent <github@multica.ai> --------- Co-authored-by: multica-agent <github@multica.ai>