docs(tess): define Pi-native interaction agent mission (#712)

docs/tess/MISSION-MANIFEST.md

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+# Mission Manifest — Tess Interaction Agent
+
+## Mission
+
+- **ID:** tess-20260712
+- **Issue:** #706
+- **Branch:** `feat/tess-interaction-agent`
+- **Phase:** Execution
+- **Current Milestone:** TESS-M1 — Runtime contracts and security foundation
+- **Progress:** 0 / 5 delivery milestones complete
+- **Status:** active
+- **Owner:** Mosaic orchestrator; Mos is coordinating fleet authority
+- **Source PRD:** `docs/PRD.md` — `TESS-*` requirements
+- **Scratchpad:** `docs/scratchpads/tess-20260712.md`
+
+## Mission Statement
+
+Ship Tess as Jason's durable Pi-native GPT-5.6 Sol high-reasoning interaction agent for Discord and CLI, with safe visibility/control of Mosaic fleet and transitional Hermes capabilities, while Mos remains the coding/general orchestration authority.
+
+## Invariants
+
+1. Mosaic is the enterprise AI hub; Hermes is a reference migration adapter.
+2. Gateway is the single API surface.
+3. Mos owns coding/general fleet orchestration; Tess owns human interaction, visibility, mediation, and migration access.
+4. Runtime, transport, channel, memory, and external-agent integrations are replaceable adapters.
+5. No source task completes before merged PR, terminal-green CI, independent review, and linked task/issue closure.
+
+## Milestones
+
+| ID | Issue | Name | Status | Exit gate |
+| --- | --- | --- | --- | --- |
+| TESS-M1 | #707 | Runtime contracts and security foundation | ready | AgentRuntimeProvider, normalized events/capabilities/errors, RBAC/audit contracts and contract tests merged |
+| TESS-M2 | #708 | Durable Pi Tess service and state | not-started | GPT-5.6 Sol high service starts, resumes, checkpoints, and passes restart/compaction tests |
+| TESS-M3 | #709 | Discord and CLI interaction surfaces | not-started | One durable session works through dedicated Discord binding and `mosaic tess`, including attach and approvals |
+| TESS-M4 | #710 | Fleet, Mos, Hermes, memory, state, and tool plugins | not-started | Fleet/Mos boundary and transitional capability matrix demonstrated end-to-end |
+| TESS-M5 | #711 | Matrix/native migration, recovery, documentation, and qualification | not-started | Transport parity, migration/rollback matrix, security review, docs, greenfield and deployment validation complete |
+
+## Success Criteria
+
+All `AC-TESS-*` criteria in `docs/PRD.md` are mapped to reproducible evidence. The final operational test must prove Discord + CLI session continuity, fleet/Mos coordination, authorized Hermes transition capabilities, denial/audit paths, restart recovery, and rollback.
+
+## Session History
+
+| Session | Date | Runtime | Outcome |
+| --- | --- | --- | --- |
+| S1 | 2026-07-12 | Hermes / GPT-5.6 Sol | User commission captured; Mosaic/OpenViking/session/code archaeology completed; issue #706 created; PRD and task control plane initialized. |