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Undercover now instruments gptel-tools/*.el alongside modules/*.el,
so the new git_status / git_log / git_diff / web_fetch tools (and
their successors) report coverage instead of reading as zero.
The matching pre-coverage clean step deletes gptel-tools/*.elc so
stale byte-compiled artifacts don't shadow the .el sources. If
Emacs loads the .elc first, undercover's source instrumentation
never runs.
docs/design/coverage.org gains an Elisp-coverage-producer subsection
documenting the glob, the :merge-report dependence (SimpleCov merges
cross-process reports, LCOV does not), and the missing-artifact
failure mode.
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Completes the coverage v1 pipeline by adding the Makefile target, the undercover driver script, the exclusion list, and the .gitignore entry. Uses simplecov JSON rather than LCOV as the collection format.
The LCOV vs simplecov choice: Undercover's :merge-report t option only supports simplecov. Since the pipeline runs tests per-file (matching test-unit's isolation pattern) and accumulates coverage across runs, merge-report is required. LCOV is better-supported by external coverage viewers, but for a primarily interactive workflow the on-disk format is an internal detail.
Other moves in this commit:
- Renamed cj/--coverage-parse-lcov to cj/--coverage-parse-simplecov and rewrote its tests for the JSON schema. Same signature, same semantics (file to set of covered lines), different parser.
- Renamed the backend protocol's :lcov-path key to :report-path, format-neutral and matching the renamed cj/--coverage-elisp-report-path function.
- The coverage target deletes modules/*.elc before running so undercover can instrument the .el sources. Without this, byte-compiled versions shadow the instrumentation and only a handful of pre-loaded modules end up with coverage data.
- Excluded tests/test-all-comp-errors.el from make coverage runs. That test byte-compiles every module, which fails under undercover's instrumentation. Excluded only from coverage. Normal make test still runs it.
- Updated docs/design/coverage.org to reflect the simplecov pivot with a historical note on why we moved off LCOV.
Verified end-to-end: make coverage produces .coverage/simplecov.json with 2717 of 4559 executable lines hit across 44 tracked modules.
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