docs(policy): correct ephapax Admitted count (3 → 1) + link adoption PR

[hyperpolymath]

Summary

The trusted-base reduction policy's P0 migration table cited 3 Admitteds in ephapax/formal/Semantics.v. The actual count on main is 1 — the other two (step_preserves_type and step_output_context_eq) were discharged via ephapax#146 (Path 3 at-pre helper landing) before this policy doc was filed.

Also adds:

• Link to formal/PRESERVATION-DESIGN.md (four-layer redesign on branch proof/l1-region-threading-design) as the principled closure plan.
• Forward link to ephapax#164 — the P0 migration PR adopting this policy in ephapax/docs/proof-debt.adoc.

No semantic change to the policy itself — just keeping the migration table accurate as repos adopt the schema.

Test plan

• One-line .adoc table cell edit; no build target affected
• GPG-signed commit (key 4A03639C…2867091E, noreply email)
• Auto-merge SQUASH enabled

🤖 Generated with Claude Code

[github-actions]

🔍 Hypatia Security Scan

Findings: 130 issues detected

Severity	Count
🔴 Critical	65
🟠 High	53
🟡 Medium	12

⚠️ Action Required: Critical security issues found!

View findings

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