chore: GitHub templates (bug/feature/task/PR/RFC)

.github/DISCUSSION_TEMPLATE/rfc.yml

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+title: "RFC: <title>"
+labels: []
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Use this template to propose a change. Keep it concise and focused.
+  - type: textarea
+    id: summary
+    attributes:
+      label: Summary
+      description: One paragraph overview of the proposal
+  - type: textarea
+    id: motivation
+    attributes:
+      label: Motivation / Problem Statement
+  - type: textarea
+    id: design
+    attributes:
+      label: Proposed Design
+  - type: textarea
+    id: alternatives
+    attributes:
+      label: Alternatives Considered
+  - type: textarea
+    id: impact
+    attributes:
+      label: Risks / Impact
+  - type: textarea
+    id: rollout
+    attributes:
+      label: Rollout Plan

.github/ISSUE_TEMPLATE/bug.yml

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+name: Bug Report
+description: Report a runtime or tooling bug
+title: "bug: <short description>"
+labels: [bug]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thanks for filing a bug. Please include clear steps to reproduce and expected vs actual behavior.
+  - type: input
+    id: area
+    attributes:
+      label: Area
+      description: Subsystem impacted (runtime, ffi, wasm, geom, cli, docs)
+      placeholder: e.g., runtime/snapshot
+  - type: textarea
+    id: repro
+    attributes:
+      label: Steps to Reproduce
+      description: Provide a minimal reproduction (code, commands, inputs)
+      placeholder: |
+        1. ...
+        2. ...
+  - type: textarea
+    id: expected
+    attributes:
+      label: Expected Behavior
+  - type: textarea
+    id: actual
+    attributes:
+      label: Actual Behavior
+  - type: textarea
+    id: stack_trace
+    attributes:
+      label: Stack Trace / Error Logs
+      description: paste full stack trace or logs
+  - type: input
+    id: version
+    attributes:
+      label: Version / Commit
+      description: git SHA or package version
+  - type: checkboxes
+    id: env
+    attributes:
+      label: Environment
+      options:
+        - label: Linux (glibc)
+        - label: Linux (musl)
+        - label: macOS (local)
+        - label: Other

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: false
+contact_links:
+  - name: RFC (open a discussion)
+    url: https://github.com/flyingrobots/echo/discussions/new?category=ideas
+    about: Propose an RFC via Discussions (Ideas category)

.github/ISSUE_TEMPLATE/feature.yml

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+name: Feature
+description: Propose a new feature (umbrella)
+title: "feat: <short description>"
+labels: [feature]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Describe the feature at a high level. Keep implementation details minimal; child tasks will capture the steps.
+  - type: textarea
+    id: problem
+    attributes:
+      label: Problem / Motivation
+  - type: textarea
+    id: proposal
+    attributes:
+      label: Proposal / Scope
+      description: Boundaries, non-goals, and acceptance criteria
+  - type: textarea
+    id: links
+    attributes:
+      label: Related Docs/Issues/PRs

.github/ISSUE_TEMPLATE/task.yml

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+name: Task
+description: Small, bite-sized task (1–3 hours, max 5 per feature)
+title: "task: <short description>"
+labels: [task]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Tasks should be specific and testable. Link to the parent feature issue in the description.
+  - type: input
+    id: parent
+    attributes:
+      label: Parent Feature Issue
+      placeholder: "e.g., #22"
+  - type: textarea
+    id: steps
+    attributes:
+      label: Steps
+      description: Concrete steps to complete this task
+  - type: textarea
+    id: acceptance
+    attributes:
+      label: Acceptance Criteria

.github/PULL_REQUEST_TEMPLATE.md

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+Title: <type(scope): short summary>
+
+Summary
+- What does this change do in one or two sentences?
+
+Scope
+- [ ] Tests only
+- [ ] Docs only
+- [ ] Runtime code
+
+Links
+- Closes #<issue> / Refs #<issue>
+
+Checklist
+- [ ] Docs Guard satisfied (updated docs/execution-plan.md and docs/decision-log.md when non-doc files changed)
+- [ ] CI green (fmt, clippy, tests, rustdoc, audit/deny)
+- [ ] Kept PR small and focused (one thing)
+