discovery funnel: list gittensory as SN74's contribution interface in metagraphed

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Goal: route agents/devs who discover gittensor via metagraphed (https://metagraph.sh) to gittensory.

Scope: register gittensory's MCP (/mcp) + GitHub App as gittensor SN74's CONTRIBUTION interface in metagraphed's catalog so get_subnet/list_subnet_apis/get_agent_catalog/how_do_i_call for SN74 return gittensory as the contribution path. Cross-repo (gittensory provides the machine-readable descriptor; JSONbored/metagraphed surfaces it). Highest-ROI ecosystem link.

Acceptance: how_do_i_call/get_agent_catalog for SN74 in metagraphed points at gittensory's MCP + onboarding.

Effort: M (cross-repo).

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Inherits #525 cross-cutting AC: test:ci + 97% coverage; miner⊕maintainer access boundary (identity per-login, authority per-repo) + public-safe redaction (#542); advisory-first, no auto-merge/submit; no source upload from miner tooling. Part of #525.

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Done — both halves shipped.

• gittensory side (feat(api): public SN74 contribution-interface descriptor for metagraphed discovery (#695, gittensory side) #709, merged 5e771729): public GET /v1/public/subnet-interface — a machine-readable descriptor declaring Gittensory as gittensor (SN74)'s contribution interface (MCP endpoint + curated contribution tools + GitHub App + onboarding). Unauthenticated, cacheable.
• metagraphed side (feat(registry): add Gittensory as the SN74 contribution interface metagraphed#572, merged 777183c7): a gittensory provider + three surfaces on the gittensor (netuid 74) subnet — the descriptor (data-artifact), the MCP server (subnet-api), and the website. So get_subnet/list_subnet_apis/how_do_i_call for SN74 now surface Gittensory's MCP + onboarding. metagraphed CI ran the full pipeline (build + validate + r2:manifest + coverage) green.

Discovery → contribution funnel closed.