P1: remediate beta.5 aggregate review findings

[gnanirahulnutakki]

Problem

The aggregate dev to main release PR #317 completed after merge and reported seven review findings. One is a real Argo CD history-completeness defect; the others are documentation, portability, or stylesheet drift. Beta tagging must remain blocked until every valid finding is fixed, reviewed, and promoted back to main.

Scope

• Preserve HistoryTruncated on the first emitted retained Argo history fact when earlier retained entries have no deployedAt, with a regression test.
• Align F10.1 documentation with the unlabeled aggregate fleet-read outcome metrics.
• Mark gitops.open-pr execution as planned P2 rather than shipped runtime behavior.
• Resolve the reported console stylesheet normalization/deprecation findings without changing rendering or accessibility behavior.
• Synchronize completed historical session statuses, sanitize the specifically reported developer-local verification paths, and clarify the internal API-contract scope statement.
• Resolve all seven release: promote demo-ready dev for v0.3.0-beta.5 #317 review threads only after exact fix evidence exists.

Out of scope

• New connector runtime wiring, GitOps execution, R2/R4 automation, authentication, authorization, persistence, cluster mutation, release tagging, or GHCR visibility changes.

Acceptance criteria

• Focused Argo projection tests include the skipped-oldest-entry truncation regression and pass under the race detector.
• All seven findings are independently validated and either fixed or closed with a concrete reason.
• Full repository CI/release policy gates pass.
• One signed DCO/GSTACK commit lands in dev; exact post-merge CI, CodeQL, and security queues are green.
• The fix is promoted to main and exact main checks pass before v0.3.0-beta.5 is tagged.

Review source

• release: promote demo-ready dev for v0.3.0-beta.5 #317
• release: promote demo-ready dev for v0.3.0-beta.5 #317 (comment)
• release: promote demo-ready dev for v0.3.0-beta.5 #317 (comment)
• release: promote demo-ready dev for v0.3.0-beta.5 #317 (comment)
• release: promote demo-ready dev for v0.3.0-beta.5 #317 (comment)
• release: promote demo-ready dev for v0.3.0-beta.5 #317 (comment)
• release: promote demo-ready dev for v0.3.0-beta.5 #317 (comment)
• release: promote demo-ready dev for v0.3.0-beta.5 #317 (comment)

[gnanirahulnutakki]

Remediation PR #319 is open against dev from verified signed commit bffe71d. Local gates passed: go mod verify, focused Argo CD race test x100, make ci, make e2e-isolation, make release-check, make e2e-kind, and git diff --check. The beta tag remains blocked until this fix lands on dev and main with exact post-merge proof.