Remove opaque `// skipped:` comments in Bridge freeze flow

[nanaf6203-bit]

Problem Statement

“skipped: token_id is u64” comments hide a known gap (see #12). Replacing them with real logic and proper events is the goal.

Why it matters

Documentation noise creates a false sense of audit-readiness.

Technical Context

Implement freeze-by-token (#12) and update comments.

Expected Outcome

No // skipped: annotations remain in bridge/src/lib.rs.

Acceptance Criteria

1. Confirm via grep.
2. Events emit on every skip case in the future if any legitimate skip remains.
3. Doc updated.

Implementation Notes

Pair with #12.

Files or modules likely to be affected

contracts/bridge/src/lib.rs.

Dependencies

#12.

Difficulty level

MEDIUM.

Estimated effort

S (~1 day).

[blessme247]

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[intelliDean]

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[SugaretaNajja]

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