feat(memory): add memory CLI command group and project memory ADRs

- Add docs/adr/ADR-001-workplan-convention.md (formalises existing convention)
- Add docs/adr/ADR-002-project-memory-convention.md (file location, structure,
  session protocols, opt-out, CLI interface)
- Implement `kaizen-agentic memory` command group: show, init, brief, clear
  - Memory stored at .kaizen/agents/<name>/memory.md in project root
  - `init` scaffolds the standard memory template with YAML frontmatter
  - `brief` lists all agent memories + note that coach synthesis is pending T13
  - `clear` deletes with confirmation prompt

WP-0002 T07 and T08 done.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

docs/adr/ADR-001-workplan-convention.md

@@ -0,0 +1,57 @@
+---
+id: ADR-001
+title: Workplan Convention
+status: accepted
+date: "2026-03-18"
+---
+
+# ADR-001 — Workplan Convention
+
+## Status
+
+Accepted
+
+## Context
+
+kaizen-agentic needs a way to track planned work that is version-controlled,
+visible to the state-hub, and authoritative when the two diverge.
+
+## Decision
+
+Work items originate as Markdown files in `workplans/` **before** being
+registered in the state-hub DB. The file is always authoritative; the DB is
+a read/query model derived from it.
+
+**File naming:** `workplans/kaizen-agentic-WP-NNNN-<slug>.md`
+**ID prefix:** `KAIZEN-WP`
+
+### Required YAML frontmatter
+
+```yaml
+---
+id: KAIZEN-WP-NNNN
+type: workplan
+title: "..."
+domain: custodian
+repo: kaizen-agentic
+status: active | completed | archived
+owner: kaizen-agentic
+topic_slug: custodian
+state_hub_workstream_id: <uuid>
+created: "YYYY-MM-DD"
+updated: "YYYY-MM-DD"
+---
+```
+
+### Task tracking
+
+Tasks use `- [ ]` / `- [x]` checkboxes with a `T##` code prefix. A
+`## State Hub Task IDs` table at the end of each workplan maps codes to
+DB UUIDs so status can be synced without a list_tasks lookup.
+
+## Consequences
+
+- File is the source of truth; DB drift is auto-fixable via
+  `check_repo_consistency(fix=True)`.
+- Tasks must be created in the file first, then registered in the hub.
+- C-12 warnings are expected when the DB host has not yet seen local changes.

docs/adr/ADR-002-project-memory-convention.md

@@ -0,0 +1,119 @@
+---
+id: ADR-002
+title: Project Memory Convention
+status: accepted
+date: "2026-03-18"
+---
+
+# ADR-002 — Project Memory Convention
+
+## Status
+
+Accepted
+
+## Context
+
+kaizen-agentic agents are stateless by default — each session starts from
+scratch with no knowledge of what has been tried, what worked, or what the
+project's recurring patterns are. This makes agents less useful over time
+and forces the operator to re-supply context that the agent itself
+accumulated.
+
+## Decision
+
+Each agent deployed into a project may maintain a **project-scoped memory
+file**. Memory files are written at session close and read at session start.
+
+### File location
+
+```
+<project-root>/.kaizen/agents/<agent-name>/memory.md
+```
+
+The `.kaizen/` directory is the kaizen-agentic ecosystem's project-level
+state directory, analogous to `.claude/` for Claude Code.
+
+### Memory file structure
+
+```markdown
+---
+agent: <agent-name>
+project: <project-root or slug>
+last_updated: <ISO date>
+session_count: <n>
+---
+
+## Project Context
+<!-- What this agent knows about the project it works in -->
+
+## Accumulated Findings
+<!-- Patterns, recurring issues, key decisions encountered -->
+
+## What Worked
+<!-- Approaches that produced good results in this project -->
+
+## Watch Points
+<!-- Recurring risks, traps, or areas requiring extra care -->
+
+## Open Threads
+<!-- Things noticed but not yet acted on -->
+
+## Session Log
+<!-- One-line entry per session: date · summary · outcome -->
+```
+
+### Session-start protocol (all memory-enabled agents)
+
+1. Check for `.kaizen/agents/<name>/memory.md` in the project root.
+2. If present, read it before beginning work.
+3. Acknowledge the memory in the opening brief.
+
+### Session-close protocol (all memory-enabled agents)
+
+1. Update `## Accumulated Findings`, `## What Worked`, `## Watch Points`
+   as needed.
+2. Append one line to `## Session Log`.
+3. Bump `last_updated` and `session_count`.
+
+### Agent opt-out
+
+An agent may declare `memory: disabled` in its YAML frontmatter to opt out.
+Default is enabled. Stateless utility agents (e.g. `keepaTodofile`) should
+opt out.
+
+### CLI interface
+
+```
+kaizen-agentic memory show <agent>   # Print agent memory for current project
+kaizen-agentic memory init <agent>   # Scaffold empty memory file
+kaizen-agentic memory brief <agent>  # Run coach, print orientation for agent
+kaizen-agentic memory clear <agent>  # Wipe memory (with confirmation prompt)
+```
+
+`memory init` creates the `.kaizen/agents/<name>/memory.md` file with the
+standard structure and populates the frontmatter.
+
+### Coaching meta-agent
+
+A dedicated `agent-coach.md` (category: `meta`) reads across all
+`.kaizen/agents/*/memory.md` files in a project and:
+
+- Synthesises a cross-agent brief (shared patterns, cross-domain risks)
+- Produces a new-agent orientation targeted at a specific agent about to
+  be deployed for the first time
+- Maintains its own memory covering meta-level fleet observations
+
+`kaizen-agentic memory brief <agent>` invokes the coach to produce this
+orientation.
+
+## Consequences
+
+- Agents accumulate project-specific knowledge and arrive in later sessions
+  informed rather than blank.
+- The `.kaizen/` directory should be added to `.gitignore` by default;
+  teams may choose to commit it for shared context.
+- Memory files are human-readable and can be manually edited or reviewed.
+- The coach agent provides a single synthesised view across all agent
+  memories — reducing the operator's burden of re-supplying context.
+- Agents with `memory: disabled` remain fully stateless and require no
+  `.kaizen/` setup.