docs: unify PIT — generic content to workspace policy, keep repo specifics

Slim the CLAUDE.md PIT pointer to the uniform cross-repo form (pointer + command);
keep only the repo-specific audio-fixture gotcha. Trim the pom PIT comment to a
policy pointer plus the repo-specific rationale (pure-Java gated classes; the
audioFile(Path) audio-fixture caveat) and drop the now-generic/stale text
(100%-gate boilerplate, 'verified with pitest-maven 1.25.4').

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_017i6A5bMhgCSbiKibQhxwuz

Author: claude

CLAUDE.md

@@ -1100,10 +1100,9 @@ See [`../workspace/policies/ci-test-diagnostics.md`](../workspace/policies/ci-te
 ## PIT Mutation Testing
 
 See [`../workspace/policies/pit-mutation-testing.md`](../workspace/policies/pit-mutation-testing.md).
-Run PIT with the lifecycle prefix — `mvn test-compile org.pitest:pitest-maven:mutationCoverage`
-(the bare goal fails with `NoSuchFileException: {argLine}`). Note: this repo's gate reaches 100%
-only with the audio fixture present; without it, `value.ContentPart.audioFile(Path)` is
-uncovered (98%) — see §4 of the policy.
+Run PIT with the lifecycle prefix — `mvn test-compile org.pitest:pitest-maven:mutationCoverage`.
+Repo-specific gotcha: the gate reaches 100% only with the audio fixture present — without it
+`value.ContentPart.audioFile(Path)` is uncovered (98%); see policy §4 and `TODO.md`.
 
 ## JPMS Module Descriptor
 

pom.xml

@@ -673,12 +673,12 @@ SPDX-License-Identifier: MIT
 			</plugin>
 			<plugin>
 				<!--
-				  PIT mutation testing is scoped to packages that have reached 100%
-					  mutation parity, gated at a 100% threshold on every CI build. Expand
-					  the targetClasses globs as further packages reach parity (see README
-					  TODO). The value/ and exception/ trees are at 100% (verified with
-					  pitest-maven 1.25.4); their unit tests are pure-Java (no native
-					  libjllama / model file needed).
+				  Generic PIT policy (version, 100% gate, invocation, expansion rule):
+				  see ../workspace/policies/pit-mutation-testing.md.
+				  Repo-specific: the gated value/exception/args/json classes are pure-Java
+				  (no native libjllama or model file needed); targetClasses/targetTests are
+				  kept in lock-step. NOTE: value.ContentPart.audioFile(Path) mutants are only
+				  killed with the audio fixture present — see TODO.md and policy §4.
 				-->
 				<groupId>org.pitest</groupId>
 				<artifactId>pitest-maven</artifactId>