diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index d8e569d3a..49c0b8ce3 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -27,6 +27,25 @@ through Pinokio; the terminal path above remains the contributor path.
 
 Open `http://localhost:4173`. Before sending a PR run `npm run build`, `npm test`, and `npm run test:track` (dev server must be up) — **all three must stay green.**
 
+### Test prerequisites
+
+- **`npm test`** — unit tests. Runs standalone; no dev server or credentials
+  required. Exit code is the gate.
+- **`npm run test:track`** — the 3D flight-tracking regression harness. It
+  drives the **real app** in headless Chromium, so it **requires a running
+  dev server** (default `http://localhost:4173`). To target another instance,
+  run `npm run test:track -- --url <app-url>` (or
+  `node scripts/track-regression.mjs --url <app-url>`). It does not depend on
+  live OpenSky / adsb.lol / AISStream (those are optional or rate-limited
+  locally); it installs a persistent `fetch` shim that returns synthetic
+  aircraft in the exact upstream payload shapes the layers parse.
+- **`npm run build`** — production Vite build. No server or credentials
+  required; it validates that the client bundle compiles cleanly.
+
+Each feature also has its own headless gate; see
+[Feature regression gates](#feature-regression-gates) below. Docs and changelog
+rules are under [Pull requests](#pull-requests).
+
 ## Checking a built app locally
 
 Run `npm run build` followed by `npm run preview`. Preview serves the built
diff --git a/DATA_SOURCES.md b/DATA_SOURCES.md
index a4035f175..403972d5e 100644
--- a/DATA_SOURCES.md
+++ b/DATA_SOURCES.md
@@ -304,6 +304,15 @@ the retrieval date (2026-07-30), exact download URL, license evidence, and the
 deterministic transform (`scripts/build-sf-neighborhoods.mjs`: `nhood` → `name`, ~2 m
 Douglas-Peucker simplification, 6-decimal rounding).
 
+### Local CCTV source packs (`config/`)
+
+The server can read a local camera list from `CCTV_SOURCES_FILE` (default
+`config/cctv_sources.austin.json`, which ships empty) and inline JSON from
+`CCTV_SOURCES_JSON`; the two are merged, and inline entries win on a duplicate
+id. A non-empty local pack replaces the live open-data camera packs unless
+`CCTV_FORCE_AUSTIN=1` is set. The packs under `config/` show the schema, and a
+pack's cameras keep their own source's license and attribution.
+
 ---
 
 ## Weather sources
diff --git a/changelog.d/210-contributor-docs-refresh.md b/changelog.d/210-contributor-docs-refresh.md
new file mode 100644
index 000000000..ed6dbe354
--- /dev/null
+++ b/changelog.d/210-contributor-docs-refresh.md
@@ -0,0 +1,4 @@
+- Contributor docs: CONTRIBUTING lists what each of the three baseline checks
+  needs to run, DATA_SOURCES documents loading a local CCTV source pack, and
+  KNOWN-ISSUES points the floor-placement note at its verification script
+  instead of a missing report (Gaurav Patidar, @gaurav7902, #210).
diff --git a/docs/KNOWN-ISSUES.md b/docs/KNOWN-ISSUES.md
index 6afd37839..53c7949c6 100644
--- a/docs/KNOWN-ISSUES.md
+++ b/docs/KNOWN-ISSUES.md
@@ -71,9 +71,9 @@ Status: Open (owner-accepted 2026-07-08, documented)
   a few stragglers take one more poll.
 - **Born-grounded first poll:** a contact first seen on the ground with no altitude
   data renders at the geoid for ≤1 poll until its floor cell warms.
-- Full context, improvement ideas, and the verification oracle
-  (`scripts/qa-floor-verify.mjs`):
-  `docs/superpowers/reports/2026-07-08-height-datum-handover.md`.
+- Verify floor-placement behavior with `scripts/qa-floor-verify.mjs` against a
+  running local app; set `QA_BASE_URL` when it is not on the default port
+  (`http://localhost:4173`).
 
 ---