fix: hook version tracking, stale hook detection, stdin timeout, and session-report command (#1153, #1157, #1161, #1162) (#1163)

* fix: hook version tracking, stale hook detection, and stdin timeout increase

- Add gsd-hook-version header to all hook files for version tracking (#1153)
- Install.js now stamps current version into hooks during installation
- gsd-check-update.js detects stale hooks by comparing version headers
- gsd-statusline.js shows warning when stale hooks are detected
- Increase context monitor stdin timeout from 3s to 10s (#1162)
- Set +x permission on hook files during installation (#1162)

Fixes #1153, #1162, #1161

* feat: add /gsd:session-report command for post-session summary generation

Adds a new command that generates SESSION_REPORT.md with:
- Work performed summary (phases touched, commits, files changed)
- Key outcomes and decisions made
- Active blockers and open items
- Estimated resource usage metrics

Reports are written to .planning/reports/ with date-stamped filenames.

Closes #1157

* test: update expected skill count from 39 to 40 for new session-report command

get-shit-done/workflows/session-report.md

@@ -0,0 +1,146 @@
+<purpose>
+Generate a post-session summary document capturing work performed, outcomes achieved, and estimated resource usage. Writes SESSION_REPORT.md to .planning/reports/ for human review and stakeholder sharing.
+</purpose>
+
+<required_reading>
+Read all files referenced by the invoking prompt's execution_context before starting.
+</required_reading>
+
+<process>
+
+<step name="gather_session_data">
+Collect session data from available sources:
+
+1. **STATE.md** — current phase, milestone, progress, blockers, decisions
+2. **Git log** — commits made during this session (last 24h or since last report)
+3. **Plan/Summary files** — plans executed, summaries written
+4. **ROADMAP.md** — milestone context and phase goals
+
+```bash
+# Get recent commits (last 24 hours)
+git log --oneline --since="24 hours ago" --no-merges 2>/dev/null || echo "No recent commits"
+
+# Count files changed
+git diff --stat HEAD~10 HEAD 2>/dev/null | tail -1 || echo "No diff available"
+```
+
+Read `.planning/STATE.md` to get:
+- Current milestone and phase
+- Progress percentage
+- Active blockers
+- Recent decisions
+
+Read `.planning/ROADMAP.md` to get milestone name and goals.
+
+Check for existing reports:
+```bash
+ls -la .planning/reports/SESSION_REPORT*.md 2>/dev/null || echo "No previous reports"
+```
+</step>
+
+<step name="estimate_usage">
+Estimate token usage from observable signals:
+
+- Count of tool calls is not directly available, so estimate from git activity and file operations
+- Note: This is an **estimate** — exact token counts require API-level instrumentation not available to hooks
+
+Estimation heuristics:
+- Each commit ≈ 1 plan cycle (research + plan + execute + verify)
+- Each plan file ≈ 2,000-5,000 tokens of agent context
+- Each summary file ≈ 1,000-2,000 tokens generated
+- Subagent spawns multiply by ~1.5x per agent type used
+</step>
+
+<step name="generate_report">
+Create the report directory and file:
+
+```bash
+mkdir -p .planning/reports
+```
+
+Write `.planning/reports/SESSION_REPORT.md` (or `.planning/reports/YYYYMMDD-session-report.md` if previous reports exist):
+
+```markdown
+# GSD Session Report
+
+**Generated:** [timestamp]
+**Project:** [from PROJECT.md title or directory name]
+**Milestone:** [N] — [milestone name from ROADMAP.md]
+
+---
+
+## Session Summary
+
+**Duration:** [estimated from first to last commit timestamp, or "Single session"]
+**Phase Progress:** [from STATE.md]
+**Plans Executed:** [count of summaries written this session]
+**Commits Made:** [count from git log]
+
+## Work Performed
+
+### Phases Touched
+[List phases worked on with brief description of what was done]
+
+### Key Outcomes
+[Bullet list of concrete deliverables: files created, features implemented, bugs fixed]
+
+### Decisions Made
+[From STATE.md decisions table, if any were added this session]
+
+## Files Changed
+
+[Summary of files modified, created, deleted — from git diff stat]
+
+## Blockers & Open Items
+
+[Active blockers from STATE.md]
+[Any TODO items created during session]
+
+## Estimated Resource Usage
+
+| Metric | Estimate |
+|--------|----------|
+| Commits | [N] |
+| Files changed | [N] |
+| Plans executed | [N] |
+| Subagents spawned | [estimated] |
+
+> **Note:** Token and cost estimates require API-level instrumentation.
+> These metrics reflect observable session activity only.
+
+---
+
+*Generated by `/gsd:session-report`*
+```
+</step>
+
+<step name="display_result">
+Show the user:
+
+```
+## Session Report Generated
+
+📄 `.planning/reports/[filename].md`
+
+### Highlights
+- **Commits:** [N]
+- **Files changed:** [N]  
+- **Phase progress:** [X]%
+- **Plans executed:** [N]
+```
+
+If this is the first report, mention:
+```
+💡 Run `/gsd:session-report` at the end of each session to build a history of project activity.
+```
+</step>
+
+</process>
+
+<success_criteria>
+- [ ] Session data gathered from STATE.md, git log, and plan files
+- [ ] Report written to .planning/reports/
+- [ ] Report includes work summary, outcomes, and file changes
+- [ ] Filename includes date to prevent overwrites
+- [ ] Result summary displayed to user
+</success_criteria>