feat(gsd-tools): add compound init commands and update workflows (#468)

* feat(gsd-tools): add compound init commands for workflow setup

Adds 8 compound commands that return all context a workflow needs in
one JSON blob, replacing 5-10 atomic calls per workflow:

- init execute-phase: models, config, phase info, plan inventory
- init plan-phase: models, workflow flags, existing artifacts
- init new-project: models, brownfield detection, state checks
- init new-milestone: models, milestone info
- init quick: models, next task number, timestamps
- init resume: file existence, interrupted agent
- init verify-work: models, phase info
- init phase-op: generic phase context

Updated 8 workflows to use compound commands:
- execute-phase, plan-phase, new-project, quick
- resume-project, verify-work, discuss-phase

Token savings: ~200 lines of bash setup replaced with single init calls.

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

* feat(gsd-tools): add 4 new init commands and update files to use compound commands

Add new compound init commands:
- init todos - context for todo workflows
- init milestone-op - context for milestone operations
- init map-codebase - context for codebase mapping
- init progress - context for progress workflow

Update 24 files to use compound init commands instead of atomic calls:
- 4 phase operation workflows (add-phase, insert-phase, remove-phase, verify-phase)
- 5 todo/milestone workflows (add-todo, check-todos, audit-milestone, complete-milestone, new-milestone)
- 6 misc workflows (execute-plan, map-codebase, pause-work, progress, set-profile, settings)
- 6 agent files (gsd-executor, gsd-planner, gsd-phase-researcher, gsd-plan-checker, gsd-debugger, gsd-research-synthesizer)
- 2 command files (debug, research-phase)
- 1 reference file (planning-config)

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

* fix(gsd-tools): add init to help output

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

* fix(verify-phase): correct expected init fields

The workflow was referencing plans/summaries from init phase-op,
but those fields come from ls command. Updated to reference
has_plans and plan_count which are actually in phase-op output.

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

---------

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

get-shit-done/workflows/insert-phase.md

@@ -44,19 +44,19 @@ fi
 
 </step>
 
-<step name="load_roadmap">
-Load the roadmap file:
+<step name="init_context">
+Load phase operation context:
 
 ```bash
-ROADMAP_EXISTS=$(node ~/.claude/get-shit-done/bin/gsd-tools.js verify-path-exists .planning/ROADMAP.md --raw)
-if [ "$ROADMAP_EXISTS" = "true" ]; then
-  ROADMAP=".planning/ROADMAP.md"
-else
-  echo "ERROR: No roadmap found (.planning/ROADMAP.md)"
-  exit 1
-fi
+INIT=$(node ~/.claude/get-shit-done/bin/gsd-tools.js init phase-op "${after_phase}")
 ```
 
+Check `roadmap_exists` from init JSON. If false:
+```
+ERROR: No roadmap found (.planning/ROADMAP.md)
+```
+Exit.
+
 Read roadmap content for parsing.
 </step>
 
@@ -94,8 +94,9 @@ Store as: `decimal_phase="$(printf "%02d" $after_phase).${next_decimal}"`
 </step>
 
 <step name="generate_slug">
-Convert the phase description to a kebab-case slug:
+Convert the phase description to a kebab-case slug.
 
+Use `generate-slug` command (init phase-op provides `phase_slug` for existing phase, but this is a new phase):
 ```bash
 slug=$(node ~/.claude/get-shit-done/bin/gsd-tools.js generate-slug "$description" --raw)
 ```