[unic-archon-dlc] Plan workflow — specs, to-prd, and first PR gate

[orioltf]

Parent

docs/issues/unic-archon-dlc/PRD.md

What to build

First half of the plan workflow: a grill-with-docs interview, live ADR writes for non-obvious decisions, a structured PRD output, and the first human approval gate.

In scope:

• .archon/workflows/plan.yaml (extended by slice 07).
• /unic-dlc-plan command file.
• specs node — grill-with-docs style:
  • Loads CONTEXT.md, CONTEXT-MAP.md (if present), all existing ADRs from docs/adr/, and docs/workflow/<slug>/findings.md if present.
  • Conducts an adversarial interview, one question at a time, challenging terminology against the domain glossary.
  • Proposes ADR entries for non-obvious decisions as they crystallise — not for every answer. Written live into docs/adr/NNNN-<slug>.md at the moment the decision is made.
  • Configurable assumptions-first mode via workflow.discuss_mode: assumptions in .archon/unic-dlc.config.json (defaults to interview). Assumptions mode is for experienced developers in established codebases — surfaces a set of assumptions for the user to correct rather than asking from scratch.
• to-prd node: synthesises the interview transcript and live-written ADRs into docs/workflow/<slug>/PRD.md with the agreed structure: Problem Statement, Solution, User Stories, Implementation Decisions, Testing Decisions, Out of Scope, Further Notes.
• First human PR gate (interactive: true): opens a PR against the working branch with PRD.md and any new ADRs staged for review. Workflow pauses until the gate is approved.

Out of scope (slice 07 and 08): to-issues, nyquist-map, plan-checker, yaml-gen, second PR gate.

Acceptance criteria

• specs loads CONTEXT.md and existing ADRs before the first interview question.
• Interview asks one question at a time (no multi-question batches) and rephrases when the user pushes back on terminology.
• At least one ADR is written into docs/adr/ during a representative session that contains a non-obvious decision; sessions with only obvious answers produce zero ADRs.
• to-prd writes docs/workflow/<slug>/PRD.md with all seven structural sections present.
• workflow.discuss_mode: assumptions flips the interview into assumptions mode; the default mode runs full interviews.
• First human PR gate blocks the workflow until approved; rejected approvals return control to specs for another iteration.
• Command file uses the unic-dlc- prefix.

Blocked by

• [unic-archon-dlc] Full install hook with all config tiers and agent docs #102

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PRD: docs/issues/unic-archon-dlc/PRD.md
Migrated from: docs/issues/unic-archon-dlc/06-plan-specs-and-to-prd.md (source removed after migration)
Touched by PRs: #33