Add memory reporting

[tellet-q]

Sample Qdrant's memory/disk telemetry after indexing (REST) and report it under results.memory in --json:

--- Memory & disk ---
total: 154.1 MiB disk, 6.2 MiB ram, 3.9 MiB cached (of 72.8 MiB expected)
vector (default): storage 66.0 MiB disk / 0.0 MiB ram, index 6.8 MiB disk / 0.0 MiB ram
payload: 67.1 MiB disk, 0.0 MiB ram
payload index color: 12.2 MiB disk, 2.7 MiB ram
process: 74.8 MiB resident, 49.0 MiB allocated (server-wide)

cached is what the page cache holds of the on-disk bytes vs. the expected a component wants cached to serve queries without hitting disk — the gap shows how cold the cache is. Runs automatically in bfb upload and legacy runs; gated off by the existing --skip-server-stats.

[Copilot]

Pull request overview

Adds post-indexing memory/disk telemetry sampling from Qdrant’s REST API and surfaces it both in stdout (“--- Memory & disk ---”) and in the JSON output under results.memory, with an opt-out flag.

Changes:

• Introduces src/memory.rs with REST wire types, fetching (/collections/{c}/memory, best-effort /telemetry), and a human-readable printer.
• Extends results JSON schema (PhaseResults) to include optional memory: Option<MemoryReport>.
• Adds --skip-server-stats to disable the REST-only sampling and documents the feature in README/DEVELOPMENT.

Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
tests/fixtures/collection_memory.json	Adds a real-world /collections/{c}/memory fixture used by parsing tests.
src/results.rs	Adds results.memory to the serialized output structure and updates roundtrip tests.
src/memory.rs	Implements REST fetching/parsing + pretty-printed memory/disk report and unit tests.
src/main.rs	Calls memory sampling after indexing in upload and legacy runs; handles best-effort failures.
src/args/mod.rs	Adds the global --skip-server-stats flag.
README.md	Documents memory/disk reporting behavior, JSON field, and port mapping.
DEVELOPMENT.md	Adds memory.rs to the source map documentation.

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