feat: 根目录文档、脚本、gitignore

.agents/skills/tgassist/references/session_yaml_schema.md

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+# session.yaml Schema (tgassist)
+
+## Fields
+
+- `schema.name`:
+  - Value: `tgassist.session`
+
+- `schema.version`:
+  - Value: `0.1`
+
+- `status.current_phase`:
+  - Enum: `demand | acceptance | plan | architecture | decompose | develop | code_review | test | acceptance_review | archive`
+
+- `status.current_round`:
+  - Integer (>= 1)
+
+- `status.state`:
+  - Enum: `in_progress | awaiting_answers | finalized`
+
+- `status.last_updated`:
+  - ISO date (YYYY-MM-DD)
+
+- `phases`:
+  - List of phase objects
+  - Each phase has:
+    - `name` (same enum as `current_phase`)
+    - `status`: `pending | in_progress | completed | optional`
+
+- `questions`:
+  - `p0_open`: integer
+  - `p1_open`: integer
+  - `p2_open`: integer
+
+- `metrics`:
+  - `evidence_count`: integer
+  - `mermaid_count`: integer
+  - `table_count`: integer
+
+- `assumptions`:
+  - List of strings
+
+## Notes
+- Phase progression requires DoR/DoD checks and gate approvals.
+- `state` becomes `awaiting_answers` when P0 questions remain.