Adopt SpecSync 5.0.1 and Trust 1.0.0

[0xLeif]

Summary

• Adopt SpecSync 5.0.1 with a verified lifecycle and 100% source coverage for the existing Standup behavior.
• Install Claude, Cursor, Codex, and Gemini integrations.
• Add the standard Trust 1.0.0 policy and immutable unified pull-request gate.
• Preserve the existing Linux, macOS, Windows, release, CodeQL, and Pages workflows.

Validation

• Definition and closing approvals recorded; the governed change is accepted.
• specsync check --strict --force passes at 100% coverage.
• fledge trust doctor reports healthy.
• Full local fledge trust verify passes with progressive provenance.
• Rustfmt, Clippy, 27 tests, release build, and compiled help smoke pass.
• Hosted required checks pass.

[gemini-code-assist]

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