I read this as implementing and fully verifying the missing trainer-session profile seam - I’ll first map the repository and deployed reference behavior, then add failing focused tests, port only the coherent trainer slice, and run the prescribed gates.


The behavioral delta is now isolated: the repository profile has no trainer symbols at all, while the deployed reference adds them across the canonical event model, wizard flow, scoped constructors, validation, safety, and persistence. I’m moving to the failing-first phase against the repository package and the exact gateway contracts, without touching the parent session’s existing work or journal.


The focused red tests now pass: canonical trainer events, scoped standalone save, trainer-specific safety provenance, and correction supersession are green. I’m in regression verification now, starting with the profile wizard/event suites; any failures will be reduced to trainer-slice compatibility issues before the broader gateway suites.


I read this as implementing and verifying the trainer-session profile seam - the seam is complete, but the required suite is blocked by one out-of-scope registry contract.

Implemented:

- Typed trainer flow, payload, intensity, event discriminator, dedupe key, and canonical builder.
- Trainer start/resume, correction, registered/private constructors, scoped validation, safety classification, and persistence.
- Trainer evidence projection and branching.
- Four focused regression tests.

Verification:

- Focused/relevant profile tests: **60 passed**
- Exact reported bridge regression: **1 passed**
- Ruff, `py_compile`, and `git diff --check`: **passed**
- Full profile suite: **739 passed**, 14 unrelated missing-policy-resource failures.
- Required three-suite: **114 passed, 47 blocked by the same contract**.

Precise missing contract:

`CustomerSpec` in `dualcoach/profile/checkin_cli/customer_coaching.py` rejects the gateway fixture’s `trainer` field as `extra_forbidden`. It needs a typed optional trainer assignment exposing `user_id`, `chat_id`, and `topic_id`. That file is outside this task’s exclusive write scope. Until restored, all registry-backed coordinator tests fail before reaching the trainer seam.

Strict type/no-excuse gates still expose substantial existing debt in the two oversized modules; `models.py` and `wizard.py` are already far above 250 pure LOC. The added trainer boundary uses Pydantic, trainer variants are exhaustively handled where introduced, and no skips, sleeps, ignores, or commits were added.


I read this as removing the single proven registry blocker within a narrowly expanded profile scope - I’ll add a failing registry test for an optional strict trainer route, implement the typed assignment without changing customer semantics, then rerun the trainer, gateway, profile, lint, type, and compile gates.


The registry boundary is green: trainer assignments now parse as an optional frozen strict subtype with inherited route key/space semantics, while unknown nested fields are rejected at `trainer.<field>`. I’m now running the required gateway suites to expose the exact post-registry regression set, then I’ll address only failures attributable to the profile seam.


All trainer regressions are now closed: the exact 14 nodeids and the full required three-suite are green. Final verification found only the repository’s pre-existing profile-policy resource failures and existing type debt; I’m doing the final focused rerun and diff hygiene check so the report separates those cleanly from this change.


I read this as closing the registry blocker and verifying the complete trainer flow - implemented and validated.

Added optional `TrainerAssignment` to `CustomerSpec`:

- Exact `user_id`, `chat_id`, and `topic_id`.
- Frozen with `extra="forbid"`.
- Inherits Telegram `key` and `space_key` semantics.
- Omitted trainer remains valid.
- Unknown nested trainer fields are rejected.

Verification:

- Exact prior trainer nodeids: **14 passed**
- Required three-suite: **161 passed**
- Focused/relevant profile tests: **100 passed**
- Ruff: **passed**
- `py_compile`: **passed**
- `git diff --check`: **passed**
- No commit created.

Remaining full-profile failures: **14**, all from missing repository policy resources:

- `test_diagnostic_evidence.py`: 2
- `test_diagnostic_policy_package.py`: 3
- `test_nutrition_onboarding.py`: 1
- `test_nutrition_onboarding_cli.py`: 1
- `test_nutrition_restriction_kb.py`: 7

Missing files:

- `checkin_cli/policies/diagnostic-promotion-policy.json`
- `checkin_cli/policies/nutrition-restriction-kb-template-v1.json`

Type gates remain non-green from existing package-wide debt:

- ty: **135 diagnostics**
- basedpyright: **141 errors, 360 warnings**

Architectural review: the new registry boundary is strict and typed, customer-only registries remain compatible, no variant escape hatch or defensive layer was added, and regression tests cover parsing, optionality, nested-field rejection, canonical persistence, safety provenance, and correction behavior. The touched production modules remain pre-existing oversized files requiring a future scoped split.