feat: extract repetitive bash patterns into gsd-tools commands (#472)

* feat(gsd-tools): add history-digest, atomic state operations, and summary variants

Adds new performance-focused commands to gsd-tools and introduces specialized
summary templates to reduce context tax:

- history-digest: Compiles phase summaries into structured JSON for JIT loading
- state get/patch: Enables atomic STATE.md operations instead of full rewrites
- template select: Automatically chooses optimal summary template based on plan complexity
- Adds minimal, standard, and complex summary templates

Part of the "Hydra" architecture for GSD context optimization.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

* chore: add project config

* docs: define v1 requirements

* docs: create roadmap (6 phases)

* feat(history-digest): fix nested YAML parsing and add tests

- Fix extractFrontmatter() to handle nested YAML structures like
  dependency-graph.provides, tech-stack.added using stack-based parsing
- Add test infrastructure with Node test runner (npm test)
- Update gsd-planner to use digest fields directly instead of reading
  full SUMMARY.md files
- Add 6 schema validation tests covering nested fields, merging,
  malformed files, and backward compatibility

Closes: HIST-01, HIST-02, HIST-03, HIST-04

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

* fix(planner): use digest for selection, full SUMMARY for understanding

The previous commit went too far by eliminating full SUMMARY reads.
The digest is an index for smart selection, not a replacement for
understanding what actually happened.

Two-step approach:
1. Digest to score/select relevant phases (2-4 typically)
2. Full SUMMARY read for selected phases (implementation details)
3. Digest-level context retained for unselected phases

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

* feat(gsd-tools): add phases, roadmap, and phase commands

TDD implementation of three new commands to replace repetitive bash:

phases list [--type plans|summaries] [--phase N]
- Lists phase directories sorted numerically (handles decimals)
- Filter by file type or specific phase
- Replaces: ls -d .planning/phases/*/ | sort -V (22 occurrences)

roadmap get-phase <N>
- Extracts phase section from ROADMAP.md
- Returns name, goal, full section content
- Replaces: grep -A20 "Phase X:" ROADMAP.md (19 occurrences)

phase next-decimal <N>
- Calculates next decimal phase (06 → 06.1, 06.2 → 06.3)
- Handles gaps, normalizes input
- Replaces: complex bash math in insert-phase (3 occurrences)

16 new tests, all passing.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

* refactor: migrate agents/workflows to use gsd-tools commands

Replace inline bash patterns with centralized gsd-tools commands:

phases list:
- audit-milestone.md: ls -d .planning/phases/*/ | sort -V
- plan-milestone-gaps.md: ls -d ... | sort -V | tail -1

roadmap get-phase:
- plan-phase.md: grep -A5 "Phase X:" ROADMAP.md (2 occurrences)
- research-phase.md: grep patterns (2 occurrences)
- verify-phase.md: grep -A5 pattern
- gsd-verifier.md: grep -A5 pattern
- gsd-plan-checker.md: grep -A10 pattern
- commands/gsd/research-phase.md: grep patterns (2 occurrences)

phase next-decimal:
- insert-phase.md: complex bash decimal calculation
- decimal-phase-calculation.md: reference doc rewritten

phase-argument-parsing.md: updated to reference gsd-tools

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>

commands/gsd/research-phase.md

@@ -47,10 +47,10 @@ RESEARCHER_MODEL=$(node ~/.claude/get-shit-done/bin/gsd-tools.js resolve-model g
 ## 1. Validate Phase
 
 ```bash
-grep -A5 "Phase ${phase_number}:" .planning/ROADMAP.md 2>/dev/null
+PHASE_INFO=$(node ~/.claude/get-shit-done/bin/gsd-tools.js roadmap get-phase "${phase_number}")
 ```
 
-**If not found (phase_found=false):** Error and exit. **If found:** Extract phase number, name, description.
+**If `found` is false:** Error and exit. **If `found` is true:** Extract `phase_number`, `phase_name`, `goal` from JSON.
 
 ## 2. Check Existing Research
 
@@ -65,7 +65,8 @@ ls .planning/phases/${PHASE}-*/RESEARCH.md 2>/dev/null
 ## 3. Gather Phase Context
 
 ```bash
-grep -A20 "Phase ${PHASE}:" .planning/ROADMAP.md
+# Phase section already loaded in PHASE_INFO
+echo "$PHASE_INFO" | jq -r '.section'
 cat .planning/REQUIREMENTS.md 2>/dev/null
 cat .planning/phases/${PHASE}-*/*-CONTEXT.md 2>/dev/null
 grep -A30 "### Decisions Made" .planning/STATE.md 2>/dev/null