Raise test coverage past the per-module gate (core ≥95%, others ≥90%)

[grammy-jiang]

What

Raises coverage so every mcp_servers module clears a per-module floor — not just the average — and enforces it in CI.

The gate

scripts/check_coverage.py reads the coverage JSON and fails if any module is below its floor:

• Core (≥95%) — the durable state/integrity/security logic: the three store.py engines, common.py, staleness.py, the egress.py SSRF guard, and all models.py.
• Other (≥90%) — the FastMCP tool wrappers (server.py) and OSINT IO helpers (exif.py, artifacts.py, audit.py).

Enforced per file so a well-covered module can't mask a thin one. Wired into the CI test job (JSON coverage report + gate step); the pyproject total backstop is also raised 80 → 90.

The tests

Six new tests/test_*_cov.py files, +82 tests (152 → 234), targeting the previously-thin branches — tool-wrapper success/error paths and main() fail-closed, store rollback/WAL/guard branches, the egress SSRF redirect + pinned-TLS path, EXIF GPS extraction, and manifest-migration edges:

Module	Before → after
calibration_tracker server / store	55→100% / 88→100%
evidence_ledger server	63→99%
ach_engine server / store	73→100% / 94→100%
osint_toolkit server / egress / exif	62→98% / 87→100% / 63→100%
common / staleness	89→100% / 92→100%

Every module now sits at 96–100%.

Verified locally

• Full suite: 234 passed on fastmcp 3.4.4.
• scripts/check_coverage.py: gate OK — all 17 modules meet their floor.
• All 14 pre-commit hooks green.

🤖 Generated with Claude Code

https://claude.ai/code/session_01Fd4FtxJFV2fVSSoD7urqqn

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Generated by Claude Code

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.14%. Comparing base (aa58b49) to head (e2b9b54).
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Additional details and impacted files

@@             Coverage Diff             @@
##           master       #7       +/-   ##
===========================================
+ Coverage   85.25%   99.14%   +13.89%     
===========================================
  Files          17       17               
  Lines        1756     1756               
===========================================
+ Hits         1497     1741      +244     
+ Misses        259       15      -244     

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