Add repo memory layer

Co-Authored-By: Claude Fable 5 <[email protected]>

.agents/MEMORY.md

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+# Repo Memory
+
+Curated, reviewed knowledge for coding agents working in this repository.
+Memory is an accelerator, not a second source of truth.
+
+## Precedence (highest first)
+
+1. Source code and tests
+2. Executable configuration
+3. Accepted design records / docs
+4. `AGENTS.md`
+5. This memory
+
+If memory conflicts with anything above it, the memory is stale — propose a fix.
+
+## Topics
+
+- `memory/architecture.md` — durable architectural decisions and constraints
+- `memory/conventions.md` — validated conventions not obvious from the code
+- `memory/lessons.md` — hard-won lessons and recurring landmines
+- `memory/decisions.jsonl` — structured decision records (one JSON object per line)
+
+## Write policy
+
+Agents MAY read everything here and MAY add candidates under `proposals/`
+(one file per proposal, named `YYYY-MM-DD-<slug>.md`, with evidence links).
+Agents MUST NOT edit `memory/` directly; trusted memory changes only through
+reviewed commits that promote a proposal.
+
+## Prohibited content
+
+Credentials or secrets, personal data, raw transcripts or tool logs, session
+TODOs, high-frequency agent state, unverified external claims.

.agents/memory/architecture.md

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+# Architecture
+
+Durable architectural decisions and constraints for this repository.
+
+## Strict CSP as a hard deployment constraint
+
+Deployment config serves every path with a strict Content-Security-Policy
+(`default-src 'none'; script-src 'self'; style-src 'self' 'unsafe-inline'`,
+plus `frame-ancestors 'none'`, `form-action 'none'`, `object-src 'none'`),
+alongside `X-Frame-Options: DENY`, `X-Content-Type-Options: nosniff`, and
+`Referrer-Policy: no-referrer`. Any change must work under this policy: no
+inline scripts, no CDN or other external origins for scripts, styles, or
+fonts; images are limited to same-origin and `data:` URIs.
+
+Authoritative source:
+- vercel.json

.agents/memory/conventions.md

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+# Conventions
+
+Validated conventions not obvious from the code.
+
+No entries yet.

.agents/memory/lessons.md

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+# Lessons
+
+Hard-won lessons and recurring landmines.
+
+No entries yet.

.agents/proposals/README.md

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+# Memory proposals
+
+Agents: drop candidate memories here, one file per proposal, named
+`YYYY-MM-DD-<slug>.md`. State the claim, the evidence (file paths, commits,
+test results), and why it is durable. A human reviews and either promotes it
+into `../memory/` in a reviewed commit or deletes it. Nothing in this
+directory is trusted context.