Clean up retired site sources and post-release documentation

[jmanico]

Change

Retired Maven Site sources still recommended 1.4.0, and completed September maintenance records were mixed with current release guidance. Remove the six unused Site files and their parity-helper special case, archive the maintenance records with corrected links, and lead MAINTAINERS.md with the latest recorded status.

Refresh the Action pin inventory, API baseline and publisher dependency documentation, verify the consumer inventory against published 1.6.0 artifacts, clarify the wrapper checksum, and add the dated Daybreak review correction. Historical evidence, release tags/assets, library code, POMs, and workflows are preserved.

Compatibility and validation

• Version policy and all 32 remaining adapter source files pass parity.
• All 36 tooling tests and 17 package-guard tests pass.
• All 208 local Markdown links/anchors pass; the six archived records retain their historical prose.
• Published 1.6.0 POM/JAR inspection confirms the documented dependency declarations and package contents. All six Action tag mappings were checked against their upstream Git refs.
• git diff --check passes. No local Java/browser rerun was needed for the documentation and obsolete parity-branch removal; required PR CI remains authoritative.
• Changed Markdown, including relocated records: 14,913 → 15,166 whitespace-delimited words; fenced code lines 68 → 35 (retired Site examples removed).

Prepared with Codex assistance; no independent maintainer approval is claimed.

• I kept the change scoped and preserved relevant notices.
• I checked documentation/changelog and tests for any behavior change.
• This PR contains no credentials or private vulnerability evidence.