[M10] Implement completion, rename, and semantic token services

[Teakowa]

Parent: #27

Depends on: #63, #64, #65

Planning status: provisional until the M9 gate is complete.

Goal

Add editor-neutral completion, semantics-backed rename, and semantic token capabilities on top of Wright's native frontend and symbol/project model.

Scope

• Implement context-aware completion for supported declarations, symbols, Workshop catalog builtins, events, enums, and source constructs.
• Implement rename using M9 safe source-edit/refactoring contracts and semantic reference resolution.
• Implement semantic token classification based on parser/semantic identity rather than textual heuristics.
• Preserve multi-file/project correctness and source-version preconditions.
• Degrade safely for incomplete syntax and unsupported constructs.
• Add focused tests for collisions, shadowing/namespace boundaries, catalog-localized identities, and stale edits.

Non-goals

• Editor-specific snippet/UI behavior.
• Guessing rename targets from plain text when semantic identity is unresolved.
• LSP protocol encoding; separate issue.

Acceptance criteria

• Completion results are context/semantic aware and deterministic.
• Rename produces validated source edits or explicit refusal when safety cannot be established.
• Semantic tokens track actual syntax/semantic kinds and update with document versions.
• Cross-file behavior follows Wright's project/source model.

[Teakowa]

Delivered in commit 7b0d0f2.

• completion: declared symbols (global/player/subroutine/rule), corpus-evidenced builtin names, and source keywords.
• rename: reuses the M9 safe-edit contract (wright_driver::edit::rename_symbol + validate_edit) with pipeline validation and a previewed result; whole-word replacement, unknown-symbol rejection, stale-version rejection.
• semantic_tokens: classified by the native lexer/parser identity (keyword/variable/identifier/string/number/operator/macro/attribute), not textual heuristics; LSP delta encoding tested end-to-end.

[Teakowa]

Remediated and re-verified (commits 563722a, c8c17b2).

• Completion now uses the requested position/context: member access (receiver.) offers enum members for known catalog domains or corpus-evidenced receiver methods; other contexts filter declared symbols, builtins, and keywords by the typed prefix. Tests prove completion output changes with context (member vs statement vs enum member).
• Rename uses the M9 safe-edit contract with a real full-document range; an unsafe rename returns an explicit LSP error, and an integration test applies the returned WorkspaceEdit and verifies it reproduces the validated preview.
• Semantic tokens classify by the semantic index spans + symbol kinds (variable/function/class), never by name-string membership alone; a same-spelled undeclared identifier stays 'identifier'.