Wisp 2.6.13: renderer and shutdown resilience, updater retry fix, drift gauge reporting

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Wisp 2.6.13

Fixes merged for this release:

• Keep native renderer E_OUTOFMEMORY from crashing Wisp and restart the HUD renderer #134 Keep native renderer E_OUTOFMEMORY from crashing Wisp and restart the HUD renderer
• End the process when a bounded shutdown wait expires instead of tearing down under a stuck worker #136 End the process when a bounded shutdown wait expires instead of tearing down under a stuck worker
• Stop the automatic update retry loop when the update helper is missing #133 Stop the automatic update retry loop when the update helper is missing
• Report the drift gauge setting in environment snapshots #132 Report the drift gauge setting in environment snapshots

This PR: version 2.6.13 in Wisp.App, Wisp.Updater, the installer script and the library-sources metadata; CHANGELOG.md (the Unreleased entry folds in); README intro and link; the in-app release notes catalog entry (2.6.13 current); docs/releases/Wisp-2.6.13-release-notes.md.

Release gate

• CI build and test on this PR.
• Native renderer contract tests (Build-NativeRenderer.ps1 -RunContractTests) run on the owner's PC against the merged commit before tagging; result recorded in the release conversation.
• Steam and Xbox: the changes touch the renderer's failure path, shutdown and the updater; no gameplay behaviour changed. A HUD-at-game-start check on each platform is the scoped manual check.