docs: apply fleet-template (16-artifact scaffold)

Adds missing standard artifacts:
- README.md (if missing)
- AGENTS.md (AI agent contract)
- PLAN.md (current sprint)
- STATUS.md (where we are)
- DEVELOPMENT.md (dev workflow)
- DEPLOYMENT.md (deploy procedure)
- TESTING.md (test strategy)
- DECISIONS.md (ADR index + templates)
- .github/CODEOWNERS
- .github/workflows/ci.yml

Preserves all existing artifacts.

Refs: RugMunchMedia/fleet-template

docs/adr/0000-template.md

@@ -0,0 +1,16 @@
+# ADR-NNNN: <Short Title>
+
+## Status
+Proposed | Accepted | Deprecated | Superseded by ADR-XXXX
+
+## Context
+What's the issue? What's the pressure for a decision?
+
+## Decision
+What did we choose?
+
+## Consequences
+What becomes easier? What becomes harder?
+
+## Alternatives
+What else did we consider? Why didn't we pick them?

docs/adr/0001-initial-architecture.md

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+# ADR-0001: Initial Architecture
+
+## Status
+Accepted · 2026-07-02
+
+## Context
+First commit of WalletPress. Need to document the foundational choices.
+
+## Decision
+- **Language**: Python 3.12 + FastAPI
+- **Port**: 8010
+- **Deployment**: Docker on Talos behind nginx
+- **Source of truth**: forgejo
+- **CI**: forgejo Actions
+- **Secrets**: gopass
+
+## Consequences
+- All future decisions build on this foundation
+- Breaking changes to these need a new ADR
+
+## Alternatives
+- _TBD_