#16654: fix: refresh skills snapshot when managed skills change

## Bug Installing managed skills to `~/.openclaw/skills/` (or restarting the gateway after adding skills) does not refresh the skills snapshot in active sessions. Sessions continue using stale skill definitions until the gateway process is fully restarted AND a new session is created. ## Root Cause In `src/auto-reply/reply/session-updates.ts`, the refresh guard is: ```typescript const shouldRefreshSnapshot = snapshotVersion > 0 && (nextEntry?.skillsSnapshot?.version ?? 0) < snapshotVersion; ``` `snapshotVersion` comes from `getSkillsSnapshotVersion()`, which returns `Math.max(globalVersion, local)`. The `globalVersion` counter is initialized to `0` in `src/agents/skills/refresh.ts`. On a fresh gateway process, `globalVersion` is `0` and no workspace-specific version exists yet, so `getSkillsSnapshotVersion()` returns `0`. The `> 0` guard makes `shouldRefreshSnapshot` always `false`, preventing any snapshot rebuild on the first session turn. The filesystem watcher correctly bumps the version when skill files change, but this only helps for *subsequent* turns after the watcher has fired — not for the cold-start case. ## Fix **One-line change:** Initialize `globalVersion = 1` instead of `0` in `src/agents/skills/refresh.ts`. This ensures: - The `snapshotVersion > 0` guard passes on the very first session turn after gateway start - Sessions always build a fresh snapshot on their first turn - The existing watcher-based bump mechanism continues to work for live file changes - No behavioral change for the remote-node bump path ## How to Test 1. Start the gateway 2. Install a new skill to `~/.openclaw/skills/` 3. Send a message in an active session 4. Verify the new skill appears in available tools ## Tests Added - `getSkillsSnapshotVersion` returns > 0 on cold start - `bumpSkillsSnapshotVersion` increases the version <!-- greptile_comment --> <h3>Greptile Summary</h3> Changes `globalVersion` initialization from `0` to `1` in `src/agents/skills/refresh.ts` to fix cold-start snapshot refresh bug. Previously, sessions would fail to build skill snapshots on first turn after gateway restart because the `snapshotVersion > 0` guard in `session-updates.ts:158` would always be false. With this one-line fix, the guard now passes and sessions correctly rebuild snapshots on cold start. <h3>Confidence Score: 5/5</h3> - Safe to merge - minimal, well-targeted fix with appropriate test coverage - Single constant change with clear intent, well-explained root cause, and new tests that verify the fix. The change is backwards-compatible and only affects initialization behavior. - No files require special attention _{Last reviewed commit: 858a08e} <!-- greptile_other_comments_section --> _{(2/5) Greptile learns from your feedback when you react with thumbs up/down!} <!-- /greptile_comment -->