fix(candidate): adopt interface 0.26 contracts

[drewstone]

Problem

agent-eval@0.120.1 resolves agent-interface@0.26.1, while runtime 0.94.12 requires <0.26 and imports removed V2 schema names. A clean consumer cannot import runtime and eval together.

Change

• narrowly port the candidate-record migration already developed in feat(candidate): execute exact approved candidates #547 onto current main
• adopt interface 0.26.1 records for bundles, execution plans, workspace evidence, task outcomes, settlements, and run receipts
• preserve the current workspace executor; exclude feat(candidate): execute exact approved candidates #547's unrelated sandbox and intelligence scope
• prepare verified file-backed knowledge and keep executor-capture receipts reference-only
• release as 0.94.13

Verification

• full tests: 153/153 files, 1,589 passed, 2 skipped
• candidate tests: 162/162 passed
• typecheck: passed with 0 errors
• lint: 450/450 files clean
• build: passed
• docs check: passed
• packed empty-consumer verification: passed
• 28,254,721-byte workspace capture produces a receipt under 100 KB with no embedded content
• merge-tree against current origin/main: clean

[tangletools]

✅ Auto-approved drewstone PR — ab64470b

This PR was opened by the trusted drewstone account.
The full PR reviewer audit still runs separately and will publish findings if it detects issues.

_{tangletools · auto-approval · reason: drewstone_author · 2026-07-15T17:17:53Z}

[tangletools]

✅ Auto-approved drewstone PR — 372e341a

This PR was opened by the trusted drewstone account.
The full PR reviewer audit still runs separately and will publish findings if it detects issues.

_{tangletools · auto-approval · reason: drewstone_author · 2026-07-15T17:20:28Z}