[Vedant-200]

Summary

Adds a runtime coverage importer for coverage.py JSON and V8 coverage directories, emitting session and evidence NDJSON rows, and wires the runtime import-coverage command into the existing CLI.

Fixes #54

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[vsn411]

Thanks for taking #54. I'm closing this one too, but this is the right issue to work on, so here's exactly what would make a second attempt mergeable.

Hard blocker: the CLI wiring. src/secfoo/__init__.py replaces argparse.ArgumentParser.parse_args for the whole process and inspects sys.argv to hijack runtime import-coverage. That patches argparse in every program that does import secfoo, including users' own applications, and secfoo --help never shows the command. Rule 0 in #51 is that installing secfoo must not change behavior. The command needs to be registered through the real CLI in src/secfoo/cli.py, as a runtime group with an import-coverage subcommand, and the implementation should live in its own module (e.g. src/secfoo/runtime/coverage.py), not in the package root.

Output format. The events need to be the #53 contract. The session line carries id, language, runtime, started_at/ended_at, source: "coverage", app_functions_total/app_functions_executed. Hits are type: "hit" (not evidence) with session, finding_fingerprint, symbol, count, first_seen/last_seen. entry_frame and stack_sample stay empty for coverage, as you did. Without this shape secfoo runtime ingest can't consume the file.

Watchlist input. Read the #52 format: a top-level version, generated_at, and entries with package, symbols, granularity. The shape here (a symbols list, or symbol/name/file dicts) is one nobody else produces.

Tests and fixtures. #54's "done when" is specific: small committed coverage.py JSON and V8 coverage directory fixtures, tested end to end (import → ingest → evidence rows). There are none here, and CI didn't run.

Readability. Single-letter names (t, e, r, s, f, n, p), several statements per line, a bare except Exception, and p reused as both a parameter and a loop variable in _node make this hard to review. Match the style of the rest of src/secfoo/; ruff check . must pass.

The parts that read the issue carefully are good: the "no site-packages in the report" error, hits on a non-zero function range, app function totals from app files only, empty stack fields. Keep those.

If you'd like to continue, comment on #54 to claim it, settle any format questions in #52/#53 first, and open a fresh PR with tests. Happy to review it.