chore(calm-suite): A2 — inventory hackathon artefacts (manifest in PR body, no diff per D-10/D-10a)

Empty commit anchoring PR finos#2 of the 5-PR Phase 1 sequence (Track A — finos#2649).

Per D-09 (Phase 1 inventory-only — no deletions) AND amended D-10 (manifest publishes inline in PR body; no committed file), the A2 deliverable is the PR body itself.
The PR diff is empty by design. The 23-row manifest is in the PR description.

D-10a corollary: a durable second copy of the manifest lives in this phase's planning archive (`.planning/phases/01-track-a-structural-cleanup/01-CONTEXT.md` — `Deferred Ideas → Phase 1 A2 manifest (durable copy per D-10a)`) which is gitignored from this branch but persists in the contributor's local working copy, so the manifest survives independently of GitHub PR archaeology.

D-04 sequencing: Phase 2 (Studio surface cleanup) unblocks once A1 (PR finos#2661) + A2 both merge.

Refs finos#2649 (Track A), finos#2600 (parent epic).

Signed-off-by: Gourav Shah <gjs@opsflow.sh>

Author: gjs-opsflo