Point CLAUDE.md at the roadmap for current phase and completion

Replace the hardcoded "Phase 0a" line with an instruction to read
docs/roadmap/summary.md first, and add a verify-report-confirm rule
for marking a phase Done in the roadmap files.

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

CLAUDE.md

@@ -19,7 +19,9 @@ The full plan lives in `docs/roadmap/`, split one file per phase so an agent
 working on a given phase doesn't have to load the other ten: `intro.md`
 (everything before Phase 0 — the platform, the resource spine, background
 reading), `phase-0.md` through `phase-10.md`, and `summary.md` (a one-page
-status/sequencing overview of all of them). Phase 0 is built test-first from
+status/sequencing overview of all of them). **Start every session with
+`docs/roadmap/summary.md`** to see where the user is — see "Current phase"
+below. Phase 0 is built test-first from
 two specs: `docs/phase-0a-test-suite-spec.md` (the tests) and
 `docs/phase-0-base-project-spec.md` (the system).
 
@@ -104,15 +106,44 @@ These override helpfulness. Breaking any of them ruins the exercise.
    and to operate tools they ask you to operate — not to name the culprit. If
    they're genuinely stuck after a real attempt, see the last Teaching Mode
    bullet: help directly rather than fishing.
-5. Outside Phase 8 these relax. Ask which phase they're in if it's unclear.
+5. Outside Phase 8 these relax. Check `docs/roadmap/summary.md` for the current
+   phase (see "Current phase" below); ask the user if it's unclear.
 
 ---
 
 ## Current phase
 
-> **Phase: 0a** — writing the integration test suite.
-> *(The user updates this line. If it looks stale relative to the conversation,
-> ask before assuming.)*
+**This file does not track the current phase.** The source of truth is the
+roadmap in `docs/roadmap/`. Before acting on anything phase-dependent (the
+spoiler rules, Teaching Mode scope, what to build next, or any "where am I /
+what's next" question), **read `docs/roadmap/summary.md` first** — its status
+table shows which phases are Done / in progress / Not started. Then read only
+the `phase-N.md` file for the phase in play (and `intro.md` for platform
+background if needed); don't load all eleven.
+
+- If the summary and the conversation disagree, or the status is ambiguous
+  (e.g. no phase is marked in progress), ask the user before assuming.
+- The "current phase" is the first phase not marked Done, unless the user says
+  otherwise.
+- Don't edit `CLAUDE.md` to record progress. Status changes go in the roadmap
+  files, following the completion rule below.
+
+### Marking a phase done
+
+Never mark a phase Done unilaterally — "Done when" is the user's judgment, and
+some criteria (e.g. "can explain out loud what the Resource attributes mean")
+can't be verified from the system alone. When a phase's **Done when** criteria
+look met:
+
+1. **Verify against the live system**, per the Verification section — check the
+   backend and the files, not the user's or your own claim that it works.
+2. **Report each criterion** as verified, failed, or unverifiable-by-Claude
+   (the last kind is the user's to attest).
+3. **Ask the user to confirm** the phase is done.
+4. **Only after an explicit yes**, update `docs/roadmap/summary.md` (the status
+   table row) and that phase's `phase-N.md` (the **Status** and **Message**
+   lines) in the same change, so the two never disagree. Also move the next
+   phase's status to "In progress" only if the user says they're starting it.
 
 Phase reference: **0a** test suite · **0b** implement to green · 1 concepts +
 first trace · 2 tracing · 3 logs · 4 metrics · 5 dashboards-as-code ·