Add the MEOS-API pin manifest, generator policy, and ecosystem orchestrator

[estebanzimanyi]

What

MEOS-API is the root of the per-binding generator policy — the catalog producer, not a generated binding. This adds:

• tools/pin/compose-order.txt — MEOS-API's own fold manifest (its enrichment + projection PRs).
• GENERATION.md — the producer framing: run.py reads the MEOS pin headers and emits output/meos-idl.json, the single source of truth every binding consumes; the generator/ modules project the language-agnostic contracts (OpenAPI/MCP/runtime/movfeat).
• tools/ecosystem-generate.sh — the turnkey orchestrator: tools/ecosystem-generate.sh <PIN> builds the catalog + all-families libmeos.so from the pin, then drives each binding's own tools/regen-from-pin.sh in dependency order (JVM consumers after the JMEOS jar; PyMEOS after PyMEOS-CFFI). GH is the only SoT — each repo is fetched fresh at its frontier branch; $HOME worktrees (never /tmp).

Docs + manifest + a bash -n-clean shell script — no compilable change.

The chain

MobilityDB pin -> MEOS-API (run.py -> meos-idl.json) + libmeos.so
   -> JMEOS (jar) -> {Spark, Flink, Kafka}
   -> PyMEOS-CFFI -> PyMEOS
   -> GoMEOS / MEOS.NET / meos-rs / MobilityDuck / MobilityNebula

Completes the per-binding generator policy across the whole ecosystem (11 binding repos + this producer).

[Nyuke235]

Approving.

Docs + manifest + orchestrator only; additive (+172/−0), merges clean, no compilable change. Verified locally: bash -n tools/ecosystem-generate.sh is clean, and the canonical catalog name output/meos-idl.json matches run.py (OUTPUT_DIR / "meos-idl.json").

Two trivial things worth folding in before merge (non-blocking):

• Manifest is already slightly stale: Add the temporal-covering descriptor to the catalog #24 (temporal-covering descriptor -> Wave 0) and Add the temporal-covering projection generator #25 (temporal-covering projection generator -> Wave 1) landed after this manifest was frozen. Worth adding now.
• Typo in GENERATION.md Pinning: "...governs this repo's enrichment/projection PR accumulate" reads as a truncated sentence.