docs(ecosystem): D142 write-back — own-converter boundary, no docmatrix dependency

[hyperpolymath]

What

F3a write-back for owner ruling D142 (2026-09-30T14:10Z, scope: repo, standards#787 harvest): the LSP plugin embeds its OWN document converter; no docmatrix dependency.

Closes #96 on merge (ruling executed).

Changes

• README.adoc: Ecosystem boundary section under tagline — own converter (server/src/core.rs + server/src/formats/), suite links (docmatrix#71, formatrix-docs, blocky-writer), non-goals.
• docs/ecosystem/ECOSYSTEM.adoc (new): full boundary record as requested by Possible conversion-boundary overlap with docmatrix — flagging it rather than ignoring it #96 — ruling provenance (F10a), suite map, composition rules, re-ruling triggers, history.
• .machine_readable/6a2/ECOSYSTEM.a2ml: machine-readable mirror (converter=embedded, docmatrix_dependency=false).
• TOPOLOGY.adoc: boundary pointer (canon lives in ECOSYSTEM.adoc).

Provenance / conduct

• D142: owner direct answer via selector; scope repo. No re-ask per Possible conversion-boundary overlap with docmatrix — flagging it rather than ignoring it #96 ruling comment.
• F5a claim: sandbox token lacks issue-comment scope (403), so the claim is recorded here + in ECOSYSTEM.adoc history instead of as an issue comment. No competing claim observed (1 comment on Possible conversion-boundary overlap with docmatrix — flagging it rather than ignoring it #96: the ruling block only).
• No estate-wide flip (F12a N/A — repo-scoped docs only). No code, no dependency, no workflow changes.
• G1 evidence: grep -Rl D142 hits all four files; all cited converter paths test -f OK; suite slugs verified via API (docmatrix, formatrix-docs, blocky-writer all resolve).

Follow-ups (owner action needed — token scope)

1. Post the close-out comment on Possible conversion-boundary overlap with docmatrix — flagging it rather than ignoring it #96 (D142 citation + write-back file list) — or close directly on merge.
2. One-line note on docmatrix#71 for its README-link acceptance row (draft in session transcript).

[coderabbitai]

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📥 Commits

Reviewing files that changed from the base of the PR and between f6cc56d and 34c59f7.

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📒 Files selected for processing (4)

• .machine_readable/6a2/ECOSYSTEM.a2ml
• README.adoc
• TOPOLOGY.adoc
• docs/ecosystem/ECOSYSTEM.adoc

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