every.channel: sanitized baseline

evolution/proposals/ECP-0047-coverage-reporting.md

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+# ECP-0047: Coverage Reporting (cargo-llvm-cov)
+
+## Why
+
+We want high confidence in stream processing, transport, and cryptographic verification code.
+That requires:
+- repeatable coverage measurement, and
+- a visible baseline so we can drive coverage up without guessing.
+
+## Proposal
+
+Adopt `cargo llvm-cov` as the canonical Rust coverage tool in this repo (already provided by `flake.nix`).
+
+Add:
+- `scripts/coverage.sh` to generate an HTML report and write a summary table to `tmp/coverage/summary.txt`.
+
+Notes:
+- `#[ignore]` E2E tests are excluded by default and do not contribute to coverage.
+- We will expand unit and non-ignored integration tests in the crates that matter most for correctness
+  (chunk framing, manifest validation, encryption, ingest adapters).
+
+## Reversibility
+
+High. This adds a script and a convention; it does not change runtime behavior.
+