refactor(aidd-pm): migrate ticket-info, prd and spec to the router contract

[blafourcade]

Problem

Eight aidd-pm skills follow the router contract. Three never migrated: 01-ticket-info, 03-prd, 04-spec. They are the only ones with no mermaid flow, and 01-ticket-info and 03-prd are the only ones with no argument-hint.

None of the three has a references/ folder, which is the root cause: their rules have nowhere to live except the router, so the router carries business logic and repeats its own actions.

• 01-ticket-info/SKILL.md:20-22 restates, near-verbatim, steps 1/2/3 of actions/01-ticket-info.md:15-17. :23 repeats the frontmatter Not for list and the intent line.
• 03-prd/SKILL.md:23 repeats actions/01-prd.md:11; :24 repeats :28 and actions/01-prd.md:16; :22 repeats actions/01-prd.md:17.
• 04-spec: the literal TBD: <precise question> lives in SKILL.md:23, actions/01-build.md:16 and actions/02-refine.md:18, with no owner. It has already drifted: actions/02-refine.md:24 writes TBD: <question>, :11 writes a bare TBD.
• The eight PRD sections are enumerated three times: assets/prd-template.md (lines 7,11,15,19,23,27,31,35), actions/01-prd.md:16 in prose, :23 again as Test headings, while SKILL.md:24 declares the template the source of truth.
• 03-prd/assets/task-template.md is dead: nothing fills it, actions/01-prd.md:15-18 only fills prd-template.md. It also carries a skill manifest as its frontmatter (name: task) and collides by name with 10-task/assets/task-template.md, the real backlog Task.
• All three use | # | Action | Role | Input | and "Before running an action, read its file", against the | Action | Does | table and "Run the flow above" of the other eight.
• 03-prd/SKILL.md:26-29 and 04-spec/SKILL.md:29-32 carry a ## Assets section no other skill has.
• Their four actions use a prose bullet list for ## Test; the other 35 actions in the plugin use a | Case | Pass | table.

Scope

• Give each of the three a references/ folder and move every rule out of its router.
• Migrate the three routers to the contract: mermaid flow, | Action | Does | table, argument-hint, no ## Assets section.
• Give the TBD: marker one home and point the three sites at it.
• Stop enumerating the PRD sections outside the template.
• Delete 03-prd/assets/task-template.md and the line announcing it.
• Convert the four ## Test sections to | Case | Pass |.

Acceptance criteria

• The eleven aidd-pm routers have the same shape, sections and section order
• No router states a rule an action or a reference could hold
• TBD: has one spelling, in one file
• Adding a section to prd-template.md requires no other edit
• Every asset in the plugin is filled by an action
• Every action carries a | Case | Pass | table

Prior art in this repo

• The eight migrated skills, 07-epic being the smallest complete example (router, three actions, five references).
• aidd_docs/CONTRIBUTING.md states the action and test contract.
• scripts/__tests__/check-backlog.test.js already guards reference reachability and skill isolation; it does not check router shape, which is why this drift is invisible in CI.

Out of scope

• Any behaviour change. The three skills keep what they do; only where their rules live changes.
• A CI test for router shape. Worth doing, but it should follow the migration rather than block it.