Add scheduled memory maintenance

[jackysp]

What changed

• add bounded memory_list keyset pagination with tenant/namespace-bound cursors
• add an explicit per-tenant memory-maintenance preset
• install a memory-only maintainer agent and a disabled-by-default weekly schedule
• document the API, architecture, security boundary, and reliability evidence

Why

Scheduled runs could not reliably enumerate a namespace, so they could not audit, deduplicate, or conservatively maintain all durable memory while staying inside the existing run/tool/schedule/trace model.

Impact

Operators can install the preset explicitly, review its resources, and enable the schedule when desired. Installation alone creates no LLM calls or memory mutations.

Validation

• cargo fmt --all -- --check
• cargo check --workspace --all-targets
• cargo test --workspace (50 passed, 1 ignored)
• cargo clippy --workspace --all-targets -- -D warnings

[Copilot]

Pull request overview

Adds first-class, scheduled memory maintenance by introducing a stable memory_list enumeration tool (with tenant/namespace-bound cursors) and an operator-installed preset that creates a memory-only maintainer agent plus a disabled-by-default weekly schedule. This fits the existing run/tool/schedule/trace model by making maintenance run through the same queued-run pipeline rather than adding a background worker.

Changes:

• Add bounded, keyset-paginated memory_list with tenant/namespace-bound cursors and supporting store API + tests.
• Add a per-tenant memory-maintenance preset endpoint that installs a memory-only agent and a disabled weekly schedule, plus server-side tests.
• Update documentation and changelog to cover the new tool, preset API, and reliability/threat-model evidence.

Reviewed changes

Copilot reviewed 14 out of 14 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
README.md	Documents memory_list and the memory-maintenance preset behavior.
docs/threat-model.md	Adds threat-model notes for bounded listing + preset isolation.
docs/reliability.md	Adds reliability claims and references to new tests for listing + preset.
docs/http-api.md	Documents the new preset endpoint and memory_list tool semantics.
docs/architecture.md	Describes enumeration and scheduled maintenance in the existing run loop.
crates/agentd-store/src/lib.rs	Implements keyset pagination for memory listing and adds store tests.
crates/agentd-server/src/server.rs	Wires the new preset route and adds an integration test.
crates/agentd-server/src/handlers/presets.rs	Implements the preset installer for agent + schedule resources.
crates/agentd-server/src/handlers/mod.rs	Exposes the new presets handler module.
crates/agentd-core/src/runtime.rs	Extends runtime tracing test to include memory_list tool events.
crates/agentd-core/src/lib.rs	Registers memory_list in the capability dispatch.
crates/agentd-core/src/handlers/memory.rs	Implements cursor encoding/decoding and the memory_list tool handler.
crates/agentd-api/src/builtin_catalog.rs	Adds memory_list to the builtin tool catalog and updates catalog tests.
CHANGELOG.md	Adds release notes for memory_list and the maintenance preset.

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