Simplify redaction module

[ypcrts]

Note

Refactor: unify redaction module

• Merge redaction/strategy.rs and redaction/mod.rs into src/redaction.rs, inlining RedactionTarget, RedactionResult, RedactionStrategy, SecureRedactionStrategy, RedactionService, and ffi helpers; add small unit tests.

Tests: increase coverage

• Expand tests/coverage_gaps_test.rs with cases for full-page redaction, Verizon call-details absent path, unicode paths, custom max_hits, and no-match flows; add domain matcher edge-case tests.

CI: coverage workflow split and caching

• Move coverage tasks from rust.yml into dedicated coverage.yml; add cargo caching; generate/upload lcov and HTML; add optional Tarpaulin job gated by workflow_dispatch. Remove coverage job from rust.yml and add cargo cache to build job.

Mutation testing config

• Update mutants.toml to exclude mod ffi in src/redaction.rs instead of the old path.

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[cursor]

Tarpaulin job condition references missing workflow trigger

Medium Severity

The if: github.event_name == 'workflow_dispatch' condition references a trigger that isn't defined in the workflow's on: section. The workflow only triggers on push and pull_request, so workflow_dispatch events will never occur for this workflow. This makes the tarpaulin job unreachable and effectively disables it entirely, rather than making it manually triggerable as presumably intended.