duocthu/docs-legacy/28-roadmap-from-code.md

28 — Roadmap from code

Not a product roadmap. This is only what the code itself says is unfinished: explicit TODOs, NotImplementedErrors, placeholder files, empty directories, unwired implementations, and code comments naming a known gap. The team's actual priorities may differ.

Explicit TODO markers

Every TODO in the repository is in the ArgoCD manifests — three per environment, identical across dev, staging, prod:

File	Line	TODO
infra/argocd/applications/{env}/app.yaml	7	confirm the team's ArgoCD project/RBAC scope
same	9	confirm the repo URL once the repo is created
same	17	point destination.server at the team's target cluster

There are no TODO/FIXME comments in any Python or TypeScript source file.

Explicit NotImplementedError

Command	File	Declared purpose
ingestion.cli visual-diff	ingestion/ingestion/cli.py:435	Render a page with detected boundaries overlaid
ingestion.cli scaffold-golden	same	Draft golden-set entries for human review

Both raise deliberately rather than silently no-op-ing, and both are covered by tests/test_cli.py.

Placeholder services (README + package.json, no source)

Path	README describes
apps/api-gateway	Public entry point, routing, JWT validation, rate limiting
apps/auth-service	Signup/login, password hashing, JWT issue/refresh
apps/user-service	Profiles, preferences, account settings
apps/chat-service	Session lifecycle, message-history persistence
apps/mobile	README + .gitkeep only

Empty scaffolding directories

Path	Contents
infra/k8s/base/{ai-service,api-gateway,auth-service,chat-service,postgres,qdrant,redis,user-service,web}	.gitkeep
infra/k8s/overlays/{dev,staging,prod}	.gitkeep
infra/terraform/envs/{dev,staging,prod}	.gitkeep
infra/terraform/modules/{k8s-cluster,managed-postgres,networking,object-storage,secrets}	.gitkeep
docs/runbooks/	.gitkeep
packages/config/eslint-preset/	.gitkeep
packages/shared-types/src/events/	.gitkeep — implies an event-driven design that does not exist
ingestion/data/{interim,qa}/	.gitkeep
ingestion/notebooks/	.gitkeep

Promised-but-absent CI workflows

infra/ci/github-actions/README.md names five workflows as "not yet functional — filled in during Phase 6". None exists:

ai-service-ci.yml, node-services-ci.yml, web-ci.yml, ingestion-ci.yml, bump-image-tag.yml.

bump-image-tag.yml is the linchpin of the GitOps flow the same README describes, so that flow cannot run.

Implemented but never called

Found by import-graph analysis, not by comment:

Code	Capability it would add	Status
rag/fusion.py::reciprocal_rank_fusion	Hybrid dense+lexical retrieval	Tested, no caller
rag/expansion.py::expand_siblings	Bounded adjacent-chunk expansion	Tested, no caller
rag/calculators.py::body_surface_area_m2	BSA-based dosing without reading a quarantined table — the docstring says that is exactly why it was written	Tested, no caller
rag/condition_evaluation.py::summarize_condition_outcomes	The full condition→drug metric suite	Tested, no runner
rag/evaluation.py::summarize	Retrieval metrics	Only run_eval.py, which uses in-memory stores
rag/routing.py::QueryRoutingService.retrieve	Legacy text-resolution path	Reached only when ANSWER_PROVIDER=disabled
adapters/bedrock_claude.py	Anthropic Messages generation path	Selectable via ANSWER_PROVIDER=bedrock-claude; not the configured provider
ingestion/embed/{bedrock_titan,local_bge_m3,benchmark_local,probe}.py	Alternative embedding providers + a local benchmark	Tested; cohere-v4 is what the corpus was built with
Golden Dataset/*.csv	209 labelled evaluation rows	Read by no code
duocthu_loop_*, duocthu_followup_inherited_total	Metrics for the retired ADR 0007 loop	Registered, never incremented
atc_codes payload index	ATC-scoped filtering	Indexed, never queried
parent_id / ParentStore hydration	Parent-document retrieval	No chunk sets parent_id
infra/docker/docker-compose.yml redis service	Cache / rate-limit counters / job queue	No client imported anywhere

Gaps the code names about itself

Each is a written comment, not an inference:

Gap	Source
"a real pool, with startup-time lifecycle, is a further improvement not made here"	adapters/postgres.py (F-09)
Conversation history durability — _last_frame/_clarify_streak still in-process	rag/agent.py, ADR 0008
The budget "cannot cancel a call already in flight; a hard per-call cancellation would need cooperative cancellation support"	rag/budget.py
Rate limiting "needs to move to Redis … or to the gateway" once web scales	apps/web/middleware.ts
/metrics "stops being safe the moment the service is exposed through an Ingress, which the Helm chart now makes possible"	apps/ai-service/main.py
"the real fix (streaming verified claims as they land)" for the long wait	apps/web/app/_components/ChatPanel.tsx
rag/agent.py "should consolidate onto this module once the new orchestrator is wired", re. the duplicate non-human keyword list	rag/policy.py
Header rows kept out of retrieval "until a reviewed logical-table artifact can prove which row is a header"	ingestion/chunk/chunker.py
Not proven by the gates: content accuracy vs the source, table row/column reconstruction, borderless-table and bar-less-formula recall	ingestion/cli.py::_cmd_chunk_ready output
Temporary timing instrumentation added 2026-08-07 for a specific bug	rag/agent.py::handle

What a code-derived backlog looks like

Ordered by what the repository itself makes cheapest and most consequential — cross-referenced to 27-technical-debt.md:

1. Run the existing 555 tests in CI before deploying (D-01).
2. Commit .env.example and a conftest.py so the suite runs out of the box (D-05, D-06).
3. Wire one of the existing eval sets to one of the existing metric summarisers (D-10).
4. Persist _last_frame/_clarify_streak, or state the single-replica constraint (D-04).
5. Decide the fate of calculators.py, fusion.py, expansion.py and the four dead metrics (D-12, D-13).
6. Backups (D-03) and a real credential (D-02).

Items 1–3 are wiring existing, tested code. None of them is new design.