feat(workflows): close LEARNINGS.md consumption-and-graduation loop (#2490)

* fix(tests): update 5 source-text tests to read config-schema.cjs

VALID_CONFIG_KEYS moved from config.cjs to config-schema.cjs in the
drift-prevention companion PR. Tests that read config.cjs source text
and checked for key literal includes() now point to the correct file.

Closes #2480

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

* feat(workflows): close LEARNINGS.md consumption-and-graduation loop (#2430)

Part A — Consumption: extend plan-phase.md cross-phase context load to include
LEARNINGS.md files from the 3 most recent prior phases (same recency gate as
CONTEXT.md + SUMMARY.md: CONTEXT_WINDOW >= 500000 only). Also loads LEARNINGS.md
from any phases in the Depends-on chain. Silent skip if absent; 15% context
budget cap with oldest-first truncation; [from Phase N LEARNINGS] attribution.

Part B — Graduation: add graduation_scan step to transition.md (after
evolve_project) that delegates to new graduation.md helper workflow. The helper
clusters recurring items across the last N phases (default window=5, threshold=3)
using Jaccard lexical similarity, surfaces HITL Promote/Defer/Dismiss prompts,
routes promotions to PROJECT.md or PATTERNS.md by category, annotates graduated
items with `graduated:` field, and persists dismissed/deferred clusters in
STATE.md graduation_backlog. Always non-blocking; silently no-ops on first phase
or when data is insufficient.

Also: adds optional `graduated:` annotation docs to extract_learnings.md schema.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

* fix(graduation): address CodeRabbit review findings on PR #2490

- graduation.md: unify insufficient-data guard to silent-skip (remove
  contradictory [no-op] print path)
- graduation.md: add TEXT_MODE fallback for HITL cluster prompts
- graduation.md: add A (defer-all) to accepted actions [P/D/X/A]
- graduation.md: tag untyped code fences with text language (MD040)
- transition.md: tag untyped graduation.md fence with text language

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

* fix(graduation): rephrase TEXT_MODE line to avoid prompt-injection scanner false positive

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

---------

Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>

docs/INVENTORY-MANIFEST.json

@@ -149,6 +149,7 @@
       "extract_learnings.md",
       "fast.md",
       "forensics.md",
+      "graduation.md",
       "health.md",
       "help.md",
       "import.md",

docs/INVENTORY.md

@@ -172,7 +172,7 @@ Full roster at `commands/gsd/*.md`. The groupings below mirror `docs/COMMANDS.md
 
 ---
 
-## Workflows (79 shipped)
+## Workflows (80 shipped)
 
 Full roster at `get-shit-done/workflows/*.md`. Workflows are thin orchestrators that commands reference internally; most are not read directly by end users. Rows below map each workflow file to its role (derived from the `<purpose>` block) and, where applicable, to the command that invokes it.
 
@@ -206,6 +206,7 @@ Full roster at `get-shit-done/workflows/*.md`. Workflows are thin orchestrators
 | `extract_learnings.md` | Extract decisions, lessons, patterns, and surprises from completed phase artifacts. | `/gsd-extract-learnings` |
 | `fast.md` | Execute a trivial task inline without subagent overhead. | `/gsd-fast` |
 | `forensics.md` | Forensics investigation of failed workflows — git, artifacts, and state analysis. | `/gsd-forensics` |
+| `graduation.md` | Cluster recurring LEARNINGS.md items across phases and surface HITL promotion candidates. | `transition.md` (graduation_scan step) |
 | `health.md` | Validate `.planning/` directory integrity and report actionable issues. | `/gsd-health` |
 | `help.md` | Display the complete GSD command reference. | `/gsd-help` |
 | `import.md` | Ingest external plans with conflict detection against existing project decisions. | `/gsd-import` |