chore: prepare v1.7.11 release

[CBEPX]

Prepare v1.7.11 with the MCP diagnostic probe-scope fix from #72 and the test scanner race fix from #71.

Synchronize package/plugin versions and both MCP clientInfo literals, add accurate changelog entries, and update the README installation references. Runtime logic and dependencies stay unchanged in this release-preparation diff.

Validation:

• Independent source, packed, and installed CLI tests pass all ten MCP-selection scenarios.
• All 93 packed files match source and isolated installed cache. Setup reports ready, authenticated, and trusted hooks.
• Real installed Opus 5.5/medium and Fable 5.1/medium reviews identify the deliberate arithmetic regression without fallback on the initial package. All runtime and skill bytes match the final package; only CHANGELOG.md differs. The final package was reinstalled and passed all ten CLI scenarios and setup checks.
• Fresh Opus 5.5/high release-diff review found no blocking issues.
• Parent full check passed: 1039 unit, 126 integration, and 33 E2E tests without skips. Hosted CI, PR mutation, and the full eight-shard release matrix must pass before release publication.

Both inherited publishers remain disabled. GitHub release assets and global pinned installation require separate readback after qualification.