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* fix(session-start): support ECC_SESSION_RETENTION_DAYS opt-out + document env var The retention pass for *-session.tmp files (issue #2151) landed previously, but the env var that controls it was undocumented in the README and rejected falsy values (0, off, disabled), silently falling back to the 30-day default. Users who want to keep all sessions for forensic or research workflows had no way to opt out. This patch: - Extends getSessionRetentionDays() so 0|off|false|disabled|never|none disables pruning entirely (returns null sentinel; default behavior unchanged). - Updates the call site in main() to skip pruneExpiredSessions when retention is null and emits a clear "[SessionStart] Pruning disabled via ECC_SESSION_RETENTION_DAYS" log line so the operator can tell pruning is off. - Documents ECC_SESSION_RETENTION_DAYS in the README "Hook Runtime Controls" section alongside the other ECC_SESSION_* knobs. - Adds three regression tests in tests/hooks/hooks.test.js covering opt-out via 0, opt-out via off, and garbage-value fallback to default 30. Verification: - node tests/hooks/hooks.test.js — 240/240 green (incl. 3 new retention tests) - node tests/run-all.js — 2622/2622 green - npx eslint scripts/hooks/session-start.js tests/hooks/hooks.test.js — clean - node scripts/ci/validate-no-personal-paths.js — clean - node scripts/ci/check-unicode-safety.js — clean - node scripts/ci/validate-hooks.js — 28 matchers validated - node scripts/ci/validate-rules.js — 115 files validated Fixes #2151 * docs(readme): list all ECC_SESSION_RETENTION_DAYS opt-out values + add Windows example Address reviewer feedback on PR #2163: - CodeRabbit and cubic both flagged that the README docs only listed 3 of 6 opt-out values accepted by getSessionRetentionDays() (0, off, disabled), while the implementation also accepts false, never, none. - cubic also flagged the missing Windows PowerShell example for the new variable, breaking the parallel structure of the existing ECC_CONTEXT_MONITOR_COST_WARNINGS example block. Updated the README to: - Spell out all six opt-out values (0, off, false, disabled, never, none) and clarify they "keep all sessions (disable pruning)". - Add an ECC_SESSION_RETENTION_DAYS line to the Windows PowerShell example. No behavior change. README only. Verification: - npx markdownlint README.md — clean - npx eslint scripts/hooks/session-start.js tests/hooks/hooks.test.js — clean