plastic-intent-discoveringlisted

# Intent Discovery — What-stage context deposit Announce: "Discovering context for intent [ID] — [name]." Runs once, at intent activation, after the lock is armed and before Why. It gathers what is already known so Why does not start cold, and deposits it as a resource the Why-stage brainstorming agent reads. ## When it fires Inside `plastic-intent-starting`, right after the bridge is armed, under the lock. Dispatched as the `plastic-intent-discovery` background agent. ## What it does 1. **Read the intent's links.** Load the activating intent file's `chain` and `sources` frontmatter fields. 2. **QMD-first discovery.** Search the Plastic stores with `scripts/qmd-sync search "<terms>"` (or the `qmd` skill), scoped to the relevant `plastic-*` collections, across completed predecessor work named in `chain`/`sources` and any related parked/future intents in INDEX.md. Fall back to ripgrep over the stores only when QMD is absent. 3. **Deposit, never author.** Write findings to `resources/discovery--<slug>.md` in the intent directory ONLY. Do not write the intent file, spec.md, or any lifecycle deliverable. The lock-owner-only write rule stays intact; the Why-stage `plastic-brainstorming` agent reads the deposit and enriches `## Context`. Shape the deposit tabular-first per `PLASTIC.md` (## Tabular-First Reporting, intent 160). ## Stage coverage This is the What-stage agent in the one-agent-per-stage table (What: intent-discovery, Why: brainstorming