add(plugin): bonfire — session-context workflow tooling

Adapted from PR #108 by @vieko (Vercel).
Original: https://github.com/anthropics/claude-plugins-official/pull/108

external_plugins/bonfire/skills/archive-bonfire/SKILL.md

@@ -0,0 +1,53 @@
+---
+description: Suggest archiving completed work when PRs are merged or work is completed. Triggers when user asks to merge a PR ("merge it", "merge the PR"), after successful gh pr merge, or mentions completion ("shipped", "done with X", "merged to main"). Does NOT archive automatically - suggests running /bonfire:archive.
+allowed-tools: Read, Glob, Bash(gh:*)
+---
+
+# Archive Bonfire Awareness
+
+This skill detects when session work may be ready for archiving and suggests the appropriate action.
+
+## When to Use This Skill
+
+Trigger when:
+- User asks to merge: "merge it", "merge the PR", "go ahead and merge", "ship it"
+- After you successfully run `gh pr merge`
+- User mentions completion: "PR merged", "shipped", "done with X", "finished"
+- User references merged state: "merged to main", "closed the issue"
+
+## Instructions
+
+1. If user asks to merge a PR:
+   - Perform the merge as requested
+   - On success, continue to step 2
+   - On failure, help resolve the issue (don't suggest archiving)
+
+2. Find git root and check if `.bonfire/index.md` exists
+
+3. If it exists, read it to assess work state
+
+4. If user provided a PR URL/number (or you just merged one), verify status:
+   ```
+   gh pr view [URL/number] --json state,mergedAt,title
+   ```
+
+5. Assess if work appears complete:
+   - PR merged?
+   - Related tasks marked done in session notes?
+   - No obvious follow-up work mentioned?
+
+6. If work appears complete, suggest archiving:
+   > "PR merged successfully. This session's work looks complete - want me to archive it?
+   > Run `/bonfire:archive` to move completed work to the archive."
+
+7. If there's more work in the session:
+   > "PR merged. I see there's still [X, Y] in the session notes - want to continue
+   > with those or archive what's done so far?"
+
+## Important
+
+- This skill **suggests** archiving, it does NOT archive automatically
+- User must explicitly run `/bonfire:archive` to perform the archive
+- Trigger AFTER merge succeeds, not before
+- Multiple PRs may be part of one logical session - check context
+- If `.bonfire/` doesn't exist, don't suggest archiving