Update(governance): adopt SpecSync 5 and Trust 1

[0xLeif]

Summary

• adopt SpecSync 5.0.1 and Trust 1.0.0 governance for the existing Speedtest plugin
• preserve Rust product behavior while documenting five stable requirements with concrete evidence
• install Claude, Cursor, Codex, and Gemini integrations with corrected user-input handling
• preserve the Linux, macOS, Windows, lint, release-packaging, Pages, and security surfaces alongside the unified Trust gate

Verified locally

• fledge lanes run verify: formatting, Clippy with warnings denied, 22/22 tests, release build, and portable help smoke
• specsync check --strict --require-coverage 100 --force: 1/1 file and 541/541 LOC (real 100%)
• verification evidence maps REQ-speedtest-001 through REQ-speedtest-005
• specsync agents status: all four integrations installed
• fledge trust doctor and fledge trust verify pass with progressive provenance
• no unresolved review threads and no merge conflict

Hosted verification

• exact-head Trust, Linux, macOS, Windows, lint, and CodeQL checks pass for 04e4e9555e75ed51718bbb70c26e788b271b5a47

No Rust product code was changed.

[gemini-code-assist]

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