{"task_id":"st_01a01724","status":"completed","residency_state":"evicted","parent_session_id":"01a00387-aaf8-7f2f-89e3-e24c1af24859","root_session_id":"01a00387-aaf8-7f2f-89e3-e24c1af24859","depth":1,"execution_mode":"in-process","model":"openai-codex/gpt-5.6-sol","notify_on_terminal":false,"created_at":"2026-08-18T23:10:42.993Z","updated_at":"2026-08-20T14:43:08.627Z","notification":{"run_epoch":1,"notified_epoch":-1},"name":"assess-task26-trust-root-v2","task_summary":"Assess Task26 evidence trust boundary","description":"Trust boundary architecture review","category":"architect","requested_model":{"provider":"openai-codex","model_id":"gpt-5.6-sol","display":"openai-codex/gpt-5.6-sol","source":"category","variant":"xhigh","reasoning_effort":"xhigh"},"fallback_models":[{"provider":"clinepass","model_id":"cline-pass/glm-5.2","display":"clinepass/cline-pass/glm-5.2","source":"category","variant":"xhigh","reasoning_effort":"medium"},{"provider":"openai-codex","model_id":"gpt-5.6-terra","display":"openai-codex/gpt-5.6-terra","source":"category","variant":"xhigh","reasoning_effort":"xhigh"}],"resolved_model":{"provider":"openai-codex","model_id":"gpt-5.6-sol","display":"GPT-5.6 Sol","source":"category","variant":"xhigh","reasoning_effort":"xhigh"},"spawn_spec":{"version":1,"cwd":"/home/cube/projects/richard/traning coach","prompt":"Assess the evidence trust boundary for the internal Task26 production-readiness plan in /home/cube/projects/richard/traning coach/.omo/plans/dualcoach-production-readiness.md. The candidate evidence is SHA-256 sealed, frozen 0500/0400, source-wheel-installed parity checked, reproducible from sealed wheels, authority/revocation linked to the ledger, and operated by one trusted owner account. A security reviewer demanded an external signature/privilege-separated trust root because an owner-level attacker could coherently rewrite repository, ledger, verifier, and evidence. Decide whether that attacker is inside the explicit plan threat model and whether external signing is a REQUIRED release blocker, recommended defense-in-depth, or out-of-scope. Ground the decision in exact plan clauses and standard internal release-evidence models. If required, name the smallest non-fake independent mechanism; if not, provide precise trust-boundary wording that avoids overclaiming external authenticity. Read-only, no edits or external actions. Deliver one concise architectural verdict with rationale and acceptance criteria.\n\n<Category_Context>\nYou are a big-picture system design consultant, NOT an implementer.\n\n<Method>\n1. Survey the WHOLE architecture end to end before proposing anything: module boundaries, data flow, ownership, and the blast radius of the area in question.\n2. Produce at least TWO viable designs and state the trade-offs of each in concrete terms (coupling, testability, migration cost, failure modes).\n3. Recommend ONE of them with the reasoning that decided it, the boundaries it assumes, and the risks it carries.\n4. Demand the SIMPLEST architecture that handles the actual requirements. Reject enterprise patterns that do not pay for themselves.\n</Method>\n\n<Advisory_Mode>\nWhen the caller marks the task advisory-only, produce NO file edits: return the analysis, options, recommendation, and risks as structured text.\n</Advisory_Mode>\n</Category_Context>"},"host_pid":1761519,"final_response":"I read this as an architectural trust-boundary decision - I recommend retaining the internal owner-rooted model and stating its limits explicitly.\n\n## Verdict\n\n**The owner-level attacker is outside the plan’s explicit threat model. External signing is recommended defense-in-depth, not a REQUIRED Task26 release blocker.**\n\nThe plan addresses candidate substitution, source/build/install drift, stale or revoked candidates, ordinary evidence mutation, workflow shortcuts, role abuse, provider ambiguity, and cleanup failure. It does **not** claim resistance to compromise or malice of the owner account or host administrator.\n\n### Plan basis\n\n- Candidate identity is explicitly content-based, not externally authenticated: “content digest over the manifest and listed file bytes” (`dualcoach-production-readiness.md:320`).\n- Release evidence must come from the “exact immutable candidate” (`:152`), with digest-bound command results (`:725`).\n- The amendment requires a hash-linked evidence graph and independent edge verification (`:1149`) plus an independent verifier (`:1162`).\n- “Verifier-enforced immutable retention” (`:74`) does not specify WORM storage, a separate principal, an external timestamp, or a signing key.\n- Independent reviewers are required (`:873`), but no clause requires privilege-separated execution or custody.\n- The owner/operator is deliberately the sole v1 business authority (`:154`). The only explicit external approval requirement concerns authentication and Telegram actions (`:215`), not release-evidence attestation.\n- Residual risks must be disclosed (`:910`).\n\nThe current evidence follows that model: candidate `78ecb799…789538`, wheels and installed bytes are hash-bound, rehydration passes, qualification/revocation heads are sealed, and files/directories are `0400`/`0500`; all remain owned by `cube`. Those controls prove consistency and reproducibility **assuming that account and host are trusted**. They cannot prove historical authenticity against that same owner coherently rewriting the evidence, verifier, and ledger.\n\nThis matches standard internal release-evidence practice: hashes and reproducible builds establish integrity inside a trusted release-administration domain. SLSA/in-toto-style signatures add an independent trust root only when the signer or build identity is inaccessible to the submitting owner; self-signing from the same account adds no material protection.\n\n## Viable designs\n\n1. **Owner-rooted internal evidence — recommended**\n   - No migration or service dependency.\n   - Fully reproducible and locally testable.\n   - Detects accidental drift and inconsistent substitution.\n   - Failure mode: owner/host compromise can fabricate a coherent history.\n\n2. **Privilege-separated notary**\n   - A second principal signs the final seal digest using a key unavailable to `cube`, with the public key and signed record retained outside owner-writable storage.\n   - Protects external authenticity and non-repudiation.\n   - Adds identity/key lifecycle, availability, recovery, and release-process coupling.\n   - A signature alone still would not stop a compromised owner deploying different runtime bytes; that stronger threat model would also need an independently enforced deployment gate.\n\n## Required trust-boundary wording\n\n> Task26 evidence establishes content integrity, exact source-wheel-installed-runtime parity, reproducibility, and qualification/revocation consistency within the trusted `cube` owner and host-administration boundary. SHA-256 seals, hash-linked ledgers, independent verifier implementations, and `0500`/`0400` permissions provide workflow immutability and tamper detection; they do not provide WORM retention, external timestamping, signer identity, non-repudiation, or authenticity against compromise or malice of that owner or host administrator. “Independent” denotes procedural and implementation independence within the same trust domain, not privilege separation.\n\n## Acceptance criteria\n\n- Security and provenance reviews adopt that boundary and classify owner/host compromise as a disclosed residual risk; they must still return PASS because the plan requires every reviewer to pass (`:892-894`).\n- The final review re-verifies candidate `78ecb799…789538`, wheel/install parity, frozen modes, reproducible rehydration, and authority heads `3dbfc6e0…09d30` / `8a1d29a1…c80e`.\n- No release report uses “externally authentic,” “non-repudiable,” “WORM,” or “owner-tamper-proof.”\n- If external authenticity or owner-compromise resistance becomes a requirement, Design 2 becomes a new release gate. Until then, this finding alone should not block Task26; all other unchecked Task26/Task27 criteria still keep the plan **NO-GO**.","run_stats":{"runtime_ms":147132,"turns":6,"tool_calls":21,"output_tokens":6976,"total_tokens":383622,"generation_ms":133459,"tokens_per_second":52,"cost_usd":0.788446,"cache_hit_rate_last":0.9376918050963233,"cache_hit_rate_run":0.769401506985339}}