Remove relocation stub from active reactor + repo-wide URL cleanup

[bernardladenthin]

Summary

• Removed the relocation stub (net.ladenthin:llamacpp-ai-index-maven-plugin) from the active reactor. It was published once at 1.0.4 as part of the 1.1.1 release, and the redirect was verified working end-to-end — a Maven resolution of the old coordinates from a completely clean local repository correctly follows the relocation through to srcmorph-maven-plugin:1.1.1 and its full dependency graph. The published artifact is permanent on Maven Central regardless of this repo's module list and will never need another release, so there's no reason to keep carrying it (and the versions:set -Dexcludes=... footgun it required) in active development.
• Updated CLAUDE.md, README.md, TODO.md, CHANGELOG.md, docs/RELEASE.md, srcmorph-maven-plugin/README.md to reflect the 3-module reactor and the stub's now-historical status.
• .github/workflows/publish.yml comment updated (no functional change needed — the stub never produced a jar, so no per-module CI step ever referenced it beyond the aggregate reactor build).
• Found and fixed a real staleness bug along the way: srcmorph's own spotbugs-exclude.xml comments still referred to the sibling plugin module by its pre-rename name (llamacpp-ai-index-maven-plugin module) instead of srcmorph-maven-plugin module — missed during the original Step 9 rename.
• Repo-wide GitHub link cleanup: renamed bernardladenthin/llamacpp-ai-index-maven-plugin URLs to the canonical bernardladenthin/srcmorph in README.md, CONTRIBUTING.md, SECURITY.md, SUPPORT.md, .github/ISSUE_TEMPLATE/config.yml, and REUSE.toml's package metadata. Left third-party service-specific identifiers untouched (SonarCloud project key, Snyk/FOSSA/Libraries.io/Scorecard/REUSE.software badges) since those may be registered under the old name independently of the GitHub repo and can't be verified from here. Updated the README's Maven Central + Snapshot badges to point at srcmorph-maven-plugin (the real, current plugin artifact) instead of the now-deprecated stub coordinates.

Test plan

• mvn clean verify from repo root — BUILD SUCCESS
• Reactor build order confirmed as 4 projects (parent + 3 real modules), no stub
• Full repo-wide grep for lingering stub/old-URL references, classified and addressed (historical mentions in CHANGELOG.md/module READMEs left as accurate history; historical benchmark output files in docs/ai-index-benchmark/ deliberately untouched, consistent with existing precedent)
• CI green on this branch (pending)

Related issues / PRs

Follow-up to #144–#148 — closes out the relocation-stub lifecycle after confirming the redirect works.

Checklist

• I have read CONTRIBUTING.md and CODE_OF_CONDUCT.md
• My commits follow Conventional Commits
• No security-sensitive changes

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Generated by Claude Code

[coveralls]

Coverage Report for CI Build 29483214795

Coverage remained the same at 90.779%

Details

• Coverage remained the same as the base build.
• Patch coverage: No coverable lines changed in this PR.
• No coverage regressions found.

Uncovered Changes

No uncovered changes found.

Coverage Regressions

No coverage regressions found.

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Coverage Stats

Relevant Lines:	2567
Covered Lines:	2404
Line Coverage:	93.65%
Relevant Branches:	925
Covered Branches:	766
Branch Coverage:	82.81%
Branches in Coverage %:	Yes
Coverage Strength:	3.9 hits per line

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💛 - Coveralls