feat(consent): add consent package — telemetry/broadcasts/reviews flags (PILOT-392)

[TeoSlayer]

Summary

• Adds github.com/pilot-protocol/common/consent package with GetConsent / SetConsent APIs
• Three flags: telemetry, broadcasts, reviews — all default to true (opt-out model)
• Persists to ~/.pilot/config.json under a "consent" subkey; reads/writes only that subkey, leaving all other top-level keys intact
• Writes are atomic via fsutil.AtomicWrite (temp-file + fsync + rename + dir fsync)
• Invalid flag name returns a descriptive error listing the three valid names

Test plan

• GOWORK=off go test -race ./consent/... — all 16 tests pass
• Absent config file → all three flags return true
• Set one flag to false → only that flag changes, others still true
• Set flag false then true → reads back true
• Invalid flag name → descriptive error, no file created
• Atomic write — no .tmp file left after successful write
• Other top-level config keys and unrelated consent flags are preserved on each write

Closes PILOT-392

🤖 Generated with Claude Code

[codecov]

Codecov Report

❌ Patch coverage is 72.54902% with 14 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
consent/consent.go	72.54%	7 Missing and 7 partials ⚠️

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