Register with Custodian State Hub and seed format open-questions workplan

Register canned-prompts under agents / practice (topic
c1d199b6-55ee-4db6-b49e-257a9f0f15ac, workplan prefix CANP-WP) via
`statehub register`, then replace the generated placeholders with
repo-specific facts.

- SCOPE.md: real boundaries drawn from INTENT.md's deliberate boundary,
  current state (spec v0.1 + reference CLI, 3/3 tests pass, example
  round-trips), and the developer workflow.
- AGENTS.md: drop the unresolved {CREDENTIAL_ROUTING} template token left
  by the generator.
- CANP-WP-0001: bootstrap tasks closed.
- CANP-WP-0002: new workplan carrying the five § 23 open questions promoted
  from "experience will decide" to "decide for v0.2" — optional-input
  defaults (static or derived), registry namespaces/ownership, prompt
  composition, canonical eval schemas, typed context/dependency contracts —
  plus two reference-implementation conformance defects found in review
  (prerelease versions sort as newest; copy_immutable packages the whole
  source directory).

Also lands the previously untracked seed: INTENT.md, the CPF v0.1 spec,
the reference CLI, and examples/pqrst-estimate.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Bjefh8NUiEiahN4JLwoSKM

Assistant: claude-code
Assistant-Model: opus
Assistant-Process: 388925@bnt-lap001
Assistant-Session: 3507023f-e0fd-4a1e-9d90-a0d4217d1502

examples/pqrst-estimate/prompt.yaml

@@ -0,0 +1,38 @@
+format: canned-prompt/v0.1
+id: practice/pqrst-estimate
+name: PQRST Estimate
+version: 0.1.0
+summary: 'Produce a post-session estimate of effort distributed across the PQRST categories
+  for an agentic coding session.
+
+  '
+type: template
+template: prompt.md
+inputs:
+- name: session_summary
+  type: content
+  required: true
+  description: 'Session transcript, summary, or sufficiently detailed account of the
+    work performed during the coding session.
+
+    '
+parameters:
+  include_rationale:
+    type: boolean
+    default: true
+    description: Explain the evidence behind the estimate.
+output:
+  format: markdown
+  description: A 100% PQRST effort allocation with concise interpretation.
+compatibility:
+  capabilities:
+  - session-review
+tags:
+- pqrst
+- retrospective
+- agentic-coding
+- effort-estimation
+provenance:
+  author: canned-prompts seed
+examples:
+- examples/basic.yaml