docs: link SEP-2640 across repo and tidy Related Work table (#90)

* Update documentation for Skills Extension SEP and related resources

- Revised links and descriptions in README.md to reflect the submitted Skills Extension SEP (PR #2640).
- Updated current status in approaches.md to indicate submission of the Skills Extension SEP.
- Clarified tracking information in open-questions.md regarding the Skills Extension SEP submission.
- Adjusted related work in related-work.md to include the Skills Extension SEP and mark a rejected proposal.
- Changed status in sep-draft-skills-extension.md to 'submitted' and updated author information.
- Enhanced skill-uri-scheme.md to indicate the incorporation of feedback into the submitted Skills Extension SEP.

* Move rejected SEP-2093 to the bottom of SEPs and Proposals table

Keeps the list active-proposals-first so readers aren't distracted by the
struck-out entry.

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Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

* Mark SEP-2076 as closed and move to the bottom of proposals table

PR #2076 was closed without merge on 2026-02-24.

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* Use SEP-2640 naming convention per MCP SEP guidelines

Per https://modelcontextprotocol.io/community/sep-guidelines, a submitted
SEP is named "SEP-<PR-number>". Rename in-repo references from "PR #2640"
to "SEP-2640" and update the draft doc heading from the "SEP-0000"
placeholder to "SEP-2640".

Also mark Approach 1's SEP-2076 status as closed (2026-02-24, no sponsor
found); approaches.md still listed it as "Draft, seeking sponsor".

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Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

* Fix SEP-2076 closure rationale

Closure followed the WG's decision to first explore a convention-based
approach using existing primitives, not a sponsor issue.

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Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

* Refine SEP-2640 description in README to clarify proposal details

* Link issues and meeting notes in Open Questions README row

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Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

* Surface SEP-2640 in README and related-work table order

README: move the Skills Extension SEP from the bottom of the Repository
Contents table to sit after Approaches, matching the narrative flow
(framing → options → proposal → supporting material).

related-work.md: lead the SEPs and Proposals table with SEP-2640 (this
WG's headline proposal), followed by the prerequisite PR #2527.

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Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

* Add 'Open work' link to README header pointing to open PRs

Signals that alternative proposals, decisions, implementations, and
other in-flight contributions are welcome — SEP-2640 is one direction,
not the only one.

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---------

Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

README.md

@@ -6,6 +6,7 @@
 **Project board:** [Skills Over MCP WG](https://github.com/orgs/modelcontextprotocol/projects/38/views/1)
 **Meeting notes:** [Skills Over MCP WG discussions](https://github.com/modelcontextprotocol/modelcontextprotocol/discussions/categories/meeting-notes-skills-over-mcp-wg)
 **Discord:** [#skills-over-mcp-wg](https://discord.com/channels/1358869848138059966/1464745826629976084)
+**Open work:** [Pull requests](https://github.com/modelcontextprotocol/experimental-ext-skills/pulls) — proposals, decisions, implementations, and other in-flight contributions welcome.
 
 ## Why Skills Over MCP?
 
@@ -34,11 +35,11 @@ See [problem-statement.md](docs/problem-statement.md) for full details.
 | [Why Skills Over MCP?](docs/why-and-when.md) | Value proposition and decision guide |
 | [Use Cases](docs/use-cases.md) | Key use cases driving this work |
 | [Approaches](docs/approaches.md) | Approaches being explored (not mutually exclusive) |
-| [Open Questions](docs/open-questions.md) | Unresolved questions with community input |
+| [SEP-2640: Skills Extension](https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2640) | Proposal to serve skills over MCP via the Resources primitive. Original working draft: [`docs/sep-draft-skills-extension.md`](docs/sep-draft-skills-extension.md). Comments and review happen on the PR. |
+| [Open Questions](docs/open-questions.md) | Unresolved questions with community input (see also [issues](https://github.com/modelcontextprotocol/experimental-ext-skills/issues) and [meeting notes](https://github.com/modelcontextprotocol/modelcontextprotocol/discussions/categories/meeting-notes-skills-over-mcp-wg)) |
 | [Experimental Findings](docs/experimental-findings.md) | Results from implementations and testing |
 | [Related Work](docs/related-work.md) | SEPs, implementations, and external resources |
 | [Decision Log](docs/decisions.md) | Record of key decisions with context and rationale |
-| [Draft SEP: Skills Extension](docs/sep-draft-skills-extension.md) | Pre-submission SEP draft defining the `skill://` resource convention |
 
 ## Contributing