[codex] Add memory lifecycle controls

[romgenie]

Summary

• Adds a coven-code memory named command for metadata-only listing, local/team delete, local/team redaction, team conflict inspection, conflict resolution, and explicitly scoped hosted namespace deletion.
• Uses existing memory/tombstone/conflict/scope helpers so lifecycle operations validate keys, reject malformed destructive arguments, avoid traversal, preserve audit metadata, and never print original memory bodies.
• Documents operator workflows for local, team, and hosted memory lifecycle controls.

Context

• Related issue/user request: Fixes Add memory retention, deletion, and redaction controls #109
• Scope: focused command surface, tests, and configuration docs for memory retention/deletion/redaction/conflict operations.
• Non-goals: server API changes, broad memory sync refactors, or changing existing memory storage formats beyond existing delete/redact helpers.

Changes

• Registers the memory named command in src-rust/crates/commands/src/named_commands.rs.
• Adds safe subcommands: list, delete, redact, conflicts, resolve-conflict, and hosted-delete.
• Fails closed on unknown flags, duplicate flags, missing flag values, and extra positional arguments for mutating memory operations.
• Requires --team for keys under the reserved team/ directory so local and team-memory targeting cannot be confused.
• Adds coverage for no-body output, tombstones, redaction stubs, traversal rejection, malformed argument rejection, local/team targeting, conflict listing/resolution, and hosted scope isolation.
• Adds docs/configuration.md lifecycle operation examples and hosted delete scope requirements.

Validation

Record exact commands and outcomes. Mark items N/A with a reason when they do not apply.

• git diff --check - passed; Git emitted line-ending normalization warnings for touched files only.
• cargo fmt --all - passed.
• cargo check --workspace - passed.
• cargo clippy --workspace --all-targets -- -D warnings - passed.
• cargo test --workspace - passed.
• Targeted/manual checks: cargo test --package claurst-commands named_commands::tests::test_memory - 17 passed.
• Review loop: repeated maintainer-style code review after each fix; final post-validation review found zero code/docs findings.
• GitHub Actions: Format, lint, and test passed on c5d89b2; Interactive terminal suite passed on c5d89b2.
• Not run: N/A.

PR Readiness

• Diff is limited to the intended files.
• Generated files were not edited by hand.
• User-facing docs/help were updated or are not needed.
• No secrets, credentials, local paths, or unrelated logs are included.
• Remaining risks or follow-up work are listed above.

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