Maturity from run history, pack revision digests, attribute sets, projects and templates (RBT-WP-0008)

Also fixes run lists and scores mixing runs of different packs in one repository.

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

Assistant: claude-code
Assistant-Model: sonnet
Assistant-Process: 295952@bnt-lap001
Assistant-Session: e93f64ad-516c-46eb-9666-aad8d300c477

docs/run-spec.md

@@ -105,3 +105,13 @@ Rules the engine enforces:
 - **Stalled**: an unfinished run is counted as `stalled` in the score, and as `abandoned` after a week.
 - **Modes** are `manual` and `auto-confirm`. Auto-confirm applies confirmation only; running the step's own
   command is a separate, later level ("auto-pilot with execution", RBT-WP-0006).
+
+## Context and revision
+
+Every run (v0.1 and v0.2) records `pack_digest`, the revision of the pack directory it used (a hash of its files,
+excluding review records, local state and `exercise_status:` lines), and `context`: the optional non-secret
+`project`, `target` and `environment` class (`rehearsal | staging | production`) it was applied to. Maturity and project
+state are derived from these (`docs/maturity-and-projects.md`). Run records of all packs in a repository share one
+folder; a pack's runs are those whose `pack_id` matches.
+
+Run timestamps have microsecond precision, so runs and feedback made within the same second still sort correctly.