docs(adr): adopt append-only ADR lifecycle - #198
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Summary
Switches the ADR lifecycle policy in
docs/adr/0001§4 from editable/in-place to append-only/immutable (the profession's settled position: Nygard, MADR), and records the rule inCLAUDE.md+.claude/rules.lock.CLAUDE.md§Documentation: the three shared ADR-lifecycle lines (never delete; a reversal is a new ADR with two-sidedSuperseded by/Supersedeslinks;Deprecatedfor a decision that no longer applies; in-place edits only for form/clarification).docs/adr/0001§4: the**ADR lifecycle**paragraph replaced with the append-only text (statusesActive/Superseded by/Deprecated, dated notice that earlier records were kept under the old editable policy). Per the issue, this change may edit ADR-0001 in place — immutability applies from its merge onward..claude/rules.lock: recordsadr-lifecycle(hashaabd778ef08e).Test plan
CLAUDE.mddocs/adr/0001§4 listsActive/Superseded by/Deprecated; the lifecycle declaration no longer says "editable".claude/rules.lockrecords the hashCloses #178