feat: support literal string map pattern keys

[tiye]

Summary

• add RFC 0090 for literal string keys in map destructuring
• accept single- and double-quoted non-interpolated keys while keeping computed keys rejected
• preserve strict atomic matching, defaults, renaming, and map rest semantics
• add core regression tests and update English/Chinese syntax indexes

Validation

• make check
• `make docs && git diff --exit-code -- "docs/manual*.html"

No new VM instruction is required; keys are lowered to the existing map pattern representation.

[Copilot]

Pull request overview

This PR extends QuickCoffee’s map destructuring (pattern matching on {...}) to accept literal string keys (single- or double-quoted) in addition to identifier keys, aligning pattern syntax with map literal capabilities while continuing to reject computed/interpolated keys.

Changes:

• Parser: allow Token::String keys in map destructuring patterns, rejecting interpolated (computed) string keys.
• Tests: add regression coverage for successful binding and failure cases with literal string keys.
• Docs/RFCs: add RFC 0090 and update English/Chinese syntax indexes plus README RFC range.

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
tests/rfc_core.rs	Adds regression tests for literal string keys in map destructuring (success + error cases).
src/parser.rs	Extends map-pattern key parsing to accept literal string tokens while rejecting computed/interpolated keys.
RFCs/0090-string-map-pattern-keys.md	New RFC documenting the contract and acceptance criteria for literal string map-pattern keys.
README.md	Updates the “RFCs range” link to include RFC 0090.
docs/syntax.zh-CN.md	Updates the Chinese syntax index to document literal string keys in map destructuring and exclude computed keys.
docs/syntax.en.md	Updates the English syntax index to document literal string keys in map destructuring and exclude computed keys.

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