feat: add spec-setup command for project initialization and interactive configuration

- Introduced a new command `spec-setup` to initialize project-level state.
- Generates `.workflow/project-tech.json` and `.ccw/specs/*.md` files.
- Implements a multi-round interactive questionnaire for configuring project guidelines.
- Supports flags for regeneration, skipping specs, and resetting existing content.
- Integrates analysis via `cli-explore-agent` for comprehensive project understanding.
- Provides detailed execution process and error handling for various scenarios.

.codex/skills/unified-execute-with-file/SKILL.md

@@ -717,7 +717,17 @@ AskUserQuestion({
 | Retry Failed | Filter tasks with `_execution.status === 'failed'`, re-execute, append `[RETRY]` events |
 | View Events | Display execution-events.md content |
 | Create Issue | `Skill(skill="issue:new", args="...")` from failed task details |
-| Done | Display artifact paths, end workflow |
+| Done | Display artifact paths, sync session state, end workflow |
+
+### Step 4.5: Sync Session State
+
+After completion (regardless of user selection), unless `--dry-run`:
+
+```bash
+$session-sync -y "Execution complete: {completed}/{total} tasks succeeded"
+```
+
+Updates specs/*.md with execution learnings and project-tech.json with development index entry.
 
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