feat!: remove semantic rename from CLI and agent surfaces

[e54-bot]

Summary

Implements #780: semantic rename is removed from Wright's CLI and agent-facing interfaces. Agents edit source directly and re-verify with check, or propose transactions through the retained validated-edit operations.

Removed:

• wright rename <NAME> <NEW_NAME> [INPUT] (raw Workshop and OPY input), including shell completions and docs — it now parses as an ordinary unknown subcommand
• semanticRename and providerSemanticRename from wright serve (stdio/JSON-RPC), MCP tools, wright agent tools, capabilities, and schemas/wright-agent-v1.schema.json
• Raw-Workshop semantic rename implementation in wright-driver (RenameTarget, SemanticRename, CompilerSession::{semantic_rename, rename}) and the provider-side named_rename/ProviderNamedRenameRequest that only the removed surfaces used, plus their tests

Preserved:

• LSP textDocument/rename on source-language documents, still routed through wright_driver::provider_edit::semantic_rename (provider-owned, versioned workspace edits)
• validateEditTransaction and providerValidateEdit — the supported caller-proposed edit path — with stale-source refusals, all-or-nothing validation, atomic writes, and rollback intact (Multi-source edit writes are not atomic when a later file fails #734)
• lint --fix fix transactions through the same validated-edit machinery
• The deprecated RenameRequest/rename_symbol helpers for wright-embedding/v1 source compatibility
• opy-rs and the LPP specification are untouched; no replacement edit operation is added

The vendored agent guide (agent-guide/wright/) is synced to wrightkit/skills@cdd694f, which dropped the rename surfaces upstream (wrightkit/skills#26, landed via #27); both pins (agent-guide/UPSTREAM.md, agent.rs) updated and the --check passes.

Verification

• cargo fmt --all -- --check: clean
• cargo clippy --workspace --all-targets --all-features -- -D warnings: clean on stable and cargo +1.85.0
• cargo test --workspace --all-targets --all-features: all suites pass, 0 failures — including the wright-lsp rename tests (versioned-edit negotiation, per-document grouping, provider routing) and the validateEditTransaction/providerValidateEdit/lint --fix tests
• git diff --check: clean
• python3 scripts/sync-agent-guide.py --check: vendored guide matches wrightkit/skills@cdd694f
• Manual checks on the built binary: wright rename score total exits 2 as unrecognized subcommand; semanticRename and providerSemanticRename requests over stdio answer malformed-request naming the 21 surviving ops; capabilities no longer advertises the removed ops; MCP tools/list shows 19 tools with wright_validate_edit_transaction/wright_provider_validate_edit retained; wright agent tools emits 21 defs with no rename; generated bash/zsh/fish/powershell completions contain no rename

Fixes #780

[Teakowa]

Reviewed the removal end to end: CLI/agent-serve/MCP/completion surfaces and the raw-Workshop-only rename code are gone; LSP textDocument/rename, provider_edit::semantic_rename, validateEditTransaction/providerValidateEdit, and lint --fix are untouched. The metrics.py comment edit is the only CODEOWNERS path touched and it is documentation-only. Local wright-cli suite passes (268 tests) including the unknown-subcommand regression; 34/34 required checks green.

One note: the vendored guide was synced from wrightkit/skills@cdd694f (post-skills#26). The skills-side PR merged ahead of the release, so the published guide already assumes this change ships in the next release — keep the feat! title so release-please marks it breaking.

[Teakowa]

LGTM