feat(product-lifecycle-learning): add product lifecycle learning skill (#194) (#219)

* feat(product-lifecycle-learning): add product lifecycle learning skill (#194)

Introduce a new skill to close the launch-to-learning loop for product features
and capabilities. Covers:

- Post-launch outcome review with explicit epistemic categories
  (expected/observed/uncertain/inferred)
- Assumption ledger updates with confidence shifts
- Multi-dimensional feature health assessment
- Six lifecycle decisions: continue/improve/harvest/pivot/pause/retire
- Full retirement lifecycle: deprecation communication, migration paths,
  customer treatment during sunset, and internal cleanup
- Durable retained learning records that feed back into roadmap, analytics,
  adoption, experimentation, and specifications

Ships 4 references (discovery brief, epistemic discipline, retirement lifecycle,
feedback destinations), 6 templates (outcome review, assumption ledger update,
feature health record, retirement decision, sunset plan, retained learning
record), and 7 eval cases including adversarial coverage.

Co-authored-by: factory-droid[bot] <138933559+factory-droid[bot]@users.noreply.github.com>

* fix(product-lifecycle-learning): regenerate marketplace with corrected description

The Claude marketplace JSON contained the original description starting with
"Close" which was replaced with "Compare" to satisfy the imperative-verb
quality check. Regenerate to match the corrected SKILL.md frontmatter.

Co-authored-by: factory-droid[bot] <138933559+factory-droid[bot]@users.noreply.github.com>

* fix(product-lifecycle-learning): regenerate llms.txt with corrected description

Co-authored-by: factory-droid[bot] <138933559+factory-droid[bot]@users.noreply.github.com>

---------

Co-authored-by: username <username>
Co-authored-by: factory-droid[bot] <138933559+factory-droid[bot]@users.noreply.github.com>

.codex-plugin/plugin.json

@@ -95,6 +95,7 @@
     "./product-design-and-ux",
     "./product-discovery",
     "./product-experimentation",
+    "./product-lifecycle-learning",
     "./product-methodology",
     "./product-operations-and-governance",
     "./product-roadmapping-and-portfolio",