feat(cli-2): add dk namespace policy get/set + bump dakera-client 0.8→0.9

[ferhimedamine]

Summary

Closes CLI-2. Exposes the full memory lifecycle policy surface via the CLI — no more raw HTTP calls to configure COG-1 TTLs, COG-3 background consolidation, or SEC-5 per-namespace rate limiting.

New commands

dk namespace policy get <namespace>

Prints the current MemoryPolicy for a namespace (TTLs, decay curves, spaced repetition, consolidation settings, rate limits, consolidated_count) in table or JSON format.

dk namespace policy set <namespace> [flags]

Read-modify-write: fetches the current policy, applies only the supplied flags, clears the read-only consolidated_count, then PUTs the result. All fields from COG-1, COG-3, and SEC-5 are exposed as named flags. Run --help for the full list.

Example:

dk namespace policy set my-agent \
  --consolidation-enabled true \
  --consolidation-threshold 0.90 \
  --rate-limit-enabled true \
  --rate-limit-stores-per-minute 60

Other changes

• Bumps dakera-client 0.8 → 0.9 to access get_memory_policy / set_memory_policy and the updated MemoryPolicy struct with SEC-5 rate-limiting fields.
• Fixes ConsolidateRequest initializer in the memory consolidate command to include the new optional config field added in dakera-client 0.9 (CE-6).

Tests

• cargo check + cargo test: 27/27 pass, 0 warnings.
• CI will run full matrix (linux-x86, linux-arm, macOS).

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