fix: resolve open-issue cluster (#2295, #2298, #2303–#2306, #2340) + createdTime fallback bug (#2408)

* fix: resolve issue cluster (#2295,#2298,#2303,#2304,#2305,#2306,#2340) + createdTime fallback bug

- session-manager: fix createdTime birthtime||ctime fallback that never fired
  (a Date is always truthy); use birthtimeMs>0 check via resolveCreatedTime()
- installer: rewrite source-relative rules/skills links for the injected
  ecc/ namespace so installed skills resolve correctly (#2340)
- continuous-learning-v2: drop unused mock import (#2305); standardize bash
  shebangs (#2303); poll for PID file instead of fixed sleep (#2295);
  rename _ecc_* -> _clv2_* (#2304); align promotion confidence docs (#2298);
  de-brittle Scope Decision Guide cross-reference (#2306)

Co-Authored-By: Devin AI <158243242+devin-ai-integration[bot]@users.noreply.github.com>

* fix(ci): resync lockfiles with package.json (eslint 10) + migrate yarn.lock to Yarn 4 format

package.json requires eslint@^10.6.0 but the committed locks pinned 9.39.2, so
npm ci aborted and Yarn 4 hardened mode rejected the stale v1-classic yarn.lock
(YN0028). Regenerate package-lock.json and rewrite yarn.lock in Yarn 4 (berry)
format so npm ci and immutable yarn installs both pass.

Co-Authored-By: Devin AI <158243242+devin-ai-integration[bot]@users.noreply.github.com>

* fix(ci): require clean probe exit for Windows shell/bash detection; add pyyaml dev dep

Co-Authored-By: Devin AI <158243242+devin-ai-integration[bot]@users.noreply.github.com>

* fix(observer): portable mktemp template on BSD/macOS (#2417); correct false attribution-disabled claim in git-workflow docs (#2426) (#2430)

Co-authored-by: affaan <affaan@itomarkets.com>
Co-authored-by: Devin AI <158243242+devin-ai-integration[bot]@users.noreply.github.com>

* fix: remove duplicate resolveCreatedTime introduced by merge (no-redeclare)

Co-Authored-By: Devin AI <158243242+devin-ai-integration[bot]@users.noreply.github.com>

* fix: restore heading-based Scope Decision Guide ref (line numbers drift) + keep behavioral #2340 install test

---------

Co-authored-by: affaan <affaan@itomarkets.com>
Co-authored-by: Devin AI <158243242+devin-ai-integration[bot]@users.noreply.github.com>
Co-authored-by: Affaan Mustafa <me@affaanmustafa.com>

scripts/lib/session-manager.js

@@ -18,10 +18,6 @@ const {
   log
 } = require('./utils');
 
-function resolveCreatedTime(stats) {
-  return stats.birthtimeMs > 0 ? stats.birthtime : stats.ctime;
-}
-
 // Session filename pattern: YYYY-MM-DD-[session-id]-session.tmp
 // The session-id is optional (old format) and can include letters, digits,
 // underscores, and hyphens, but must not start with a hyphen.
@@ -30,6 +26,18 @@ function resolveCreatedTime(stats) {
 // "2026-02-01-ChezMoi_2-session.tmp"
 const SESSION_FILENAME_REGEX = /^(\d{4}-\d{2}-\d{2})(?:-([a-zA-Z0-9_][a-zA-Z0-9_-]*))?-session\.tmp$/;
 
+/**
+ * Resolve a file's creation time, preferring birthtime but falling back to
+ * ctime when birthtime is unavailable. Some filesystems (e.g. overlayfs in
+ * containers) report birthtime as epoch 0; a Date object is always truthy, so
+ * `birthtime || ctime` would never fall back. Compare on milliseconds instead.
+ * @param {import('fs').Stats} stats
+ * @returns {Date}
+ */
+function resolveCreatedTime(stats) {
+  return stats.birthtimeMs > 0 ? stats.birthtime : stats.ctime;
+}
+
 /**
  * Parse session filename to extract metadata
  * @param {string} filename - Session filename (e.g., "2026-01-17-abc123-session.tmp" or "2026-01-17-session.tmp")