[CA-01-S5] Document the Jim and Echo application lifecycle

[flyingrobots]

Goal

Publish a detailed, evidence-grounded case study showing how Jim is built on Echo, including ownership boundaries, application startup, intent admission, scheduling, contract execution, receipts, materialization, causal-anchor save semantics, shutdown, and recovery.

Acceptance criteria

• docs/case-studies/JimAndEcho.md distinguishes Jim-owned semantics, Echo-owned authority, host resources, and derived projections.
• One full-depth interaction traces typing one character through proposal, durable admission, scheduler execution, application rewrite, receipt/provenance, rendering, user-save anchor, shutdown, and restart.
• Mermaid diagrams and step tables identify commit/linearization boundaries and failure behavior.
• The document separates currently implemented APIs from future architecture and never promotes WAL, queues, BTR/holograms, CAS materializations, or value-only constructors into causal authority.
• The docs index links the case study and Markdown validation passes.

[coderabbitai]

🔗 Related PRs

#329 - Stack Witness 0001 fixture-backed jedit walking skeleton [merged]
#371 - feat(core): advance v0.1 contract evidence and retention [merged]
#529 - Add Hello Echo demo and docs lifecycle policy [merged]
#540 - Add Echo-owned file aperture [merged]
#582 - docs: define the Echo 1.0 release contract and move live planning to GitHub [merged]

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[flyingrobots]

Implemented in 019ec02. docs/case-studies/JimAndEcho.md traces ownership, startup, proposal admission, WAL linearization, scheduling, application rewrite, receipts, rendering, save anchoring, shutdown, and restart while distinguishing implemented APIs from future architecture.