docs: establish integrated project memory

.project-docs/50-evidence/evidence-index.md

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+# Evidence Index
+
+Use this index for searchable, traceable evidence records.
+
+| Date | Topic | Status | Source | Detail |
+|---|---|---|---|---|
+| 2026-08-11 | Public display API contract used by the native app | Verified | Source code and tests | [Evidence](topics/20260811-native-display-f2456ea9__public-display-api.md) |
+| 2026-08-12 | Embedded Mandarin WAV provenance, mapping, format, and acceptance | Verified with known licensing gap | Git history, WAV inspection, ASR, tests | [Evidence](topics/20260811-native-display-f2456ea9__embedded-audio-assets.md) |
+| 2026-08-12 | Batch range endpoint clipping and fitted-text fix | Verified in host tests; target-TV acceptance pending | Production snapshot, code, Robolectric, APK checks | [Evidence](topics/20260811-native-display-f2456ea9__range-display-fit.md) |
+
+## When To Add Evidence
+
+Add a topic file when a task depends on logs, commits, test output, external docs, bug reproduction, experiments, or postmortem-level reasoning.
+
+Keep task progress in `30-worklog/`; keep reusable workflow lessons in `60-reflection/`.

.project-docs/50-evidence/topic-template.md

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+# Evidence Topic: {short title}
+
+## Metadata
+
+- Date:
+- Status: Active | Resolved | Superseded | Stale
+- Scope:
+- Confidence: Fact | Inference | Hypothesis
+- Source:
+- Last verified:
+- Stale trigger:
+
+## Question
+
+What needed evidence?
+
+## Evidence
+
+- Commit:
+- Files:
+- Commands:
+- Logs:
+- External source:
+
+## Finding
+
+What does the evidence support?
+
+## Impact
+
+What future planning or implementation should this affect?
+
+## Open Items
+
+-