Clarify wave-2 milestone and evidence coordination

[coneilen]

Summary

Clarify wave-2 milestone enforcement and retain the runtime/coordination lessons without changing product behavior, execution authority, or parity status.

Changes

• Preserve the coordinator's 51 transferred policy/retrospective insertions, reanchored to current main without deleting any existing text: advisory milestone call budgets, binding time/outcome boxes, unchanged lifetime ceilings, bounded coordinator-authorized mechanical recovery, and PowerShell interpolation preflight.
• Record job-scoped capture gates, timing instrumentation inside the existing read budget, and authoritative PR-body coordination. Retain failed attempts and distinguish observed results from unobserved causes.
• Change only the canonical kickoff and orchestration plan. All 98 ledger identities/statuses remain unchanged at 6 Validated / 89 Partial / 3 Out of scope; B/C/D/E live visual acceptance remains NotExecuted (Windows capture core: journal check-then-open race fails UiCaptureDriver tests intermittently on main #826).

Test plan

RED: pwsh -NoProfile -File Tools\tdd\Test-TddEvidence.ps1 -BodyPath .github\PULL_REQUEST_TEMPLATE.md -> exit 1, "RED evidence is still a placeholder." (one expected rejection; PR-body validation only, not runtime/product RED).
GREEN: pwsh -NoProfile -File Tools\tdd\Test-TddEvidence.ps1 -BodyPath "$env:GRAPHCODE_DOCS_PACKET\pr-body.md" -> exit 0, "TDD evidence: PASS" (one completed PR body accepted).
REGRESSION: pwsh -NoProfile -File Tools\tdd\Tests\TddEvidence.Tests.ps1; pwsh -NoProfile -File Tools\windows\validate.ps1 -Task privacy; git --no-pager diff --check -> both scripts exit 0 with one suite PASS and one privacy success summary; diff exits 0 with no whitespace errors.

GRAPHCODE_DOCS_PACKET names the session-private packet directory; TEMP and TMP were scoped there for validation. These are existing documentation/body/privacy checks, not product regression or a new gate. The checker suite emits one completion marker, not a test-runner case count.

The initial immutable transfer's git apply --check exited 1 at kickoff hunk 115 before repository edits. Its hash and actual error were retained; the coordinator explicitly authorized context-only manual integration with the original deadline and file scope unchanged. The patch was not forced or silently retried.

Not verified: product builds, make test, make check, native/runtime behavior, GUI/capture, keyboard input, accessibility, rendering, persistence, or cross-platform/visual parity. No product/harness/source changes, images, ledger edits, or new execution grants. Historical Gjp8/Windows 2025 results are coordinator-supplied retrospective facts, not runs performed by this documentation owner. Actor-cleanup cause remains unobserved (#846); the body-guard failure does not establish an API race.

Publication status: publication is limited to a signed-off, pushed, docs-only draft; this PR grants no runtime or desktop lease. Exact-head checks must be satisfied before readiness and merge; coordinator/operator own those transitions.

Checklist

• I have read the Contributing Guidelines
• I have signed off my commits (git commit -s) per the DCO
• Tests pass locally (make test)
• Code follows the existing style (make check)
• I added the test/contract before the implementation and observed the intended RED failure

Unchecked items are intentional: product build/test/lint commands are outside this docs-only lease, and the existing template rejection is body-validation RED rather than a newly authored product contract.