docs(portfolio): reconcile control-plane authority evidence

[aparragithub]

Closes #225

Summary

• reconcile all SP4B and control-plane authority targets with admitted delivery evidence
• enforce fail-closed lineage, boundary, and downstream-readiness integrity checks
• preserve SP-DATA-ENVIRONMENTS as proposed at G0

PR Type

• Documentation only
• Bug fix
• New feature
• Code refactoring
• Maintenance/tooling
• Breaking change

Changes

File	Change
docs/specs/platform/portfolio.json	Reconcile canonical target status and evidence references
tests/portfolio/test_portfolio_integrity.py	Add fail-closed acceptance and lineage integrity gates

Test Plan

• uv run pytest tests/portfolio/test_portfolio_integrity.py -q — 100 passed
• uv run pytest tests/portfolio -q — 107 passed
• uv run pytest -q — 2081 passed
• portfolio validator — clean, 0 violations
• Ruff, formatter, mypy, import-linter, and build passed

Contributor Checklist

• Linked issue
• Exactly one type:* label
• Conventional commit
• No AI attribution or co-author trailer
• No shell scripts modified; shellcheck not applicable

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📥 Commits

Reviewing files that changed from the base of the PR and between 1d35b0b and 381d461.

📒 Files selected for processing (2)

• docs/specs/platform/portfolio.json
• tests/portfolio/test_portfolio_integrity.py

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