[codex] Implement PR11.11a method syntax

[agentc1]

Summary

• add receiver-parameter declaration syntax and preserve it in the source AST/schema
• lower selector calls like value.method(...) onto ordinary first-parameter calls, including imported public functions and existing list/map builtins
• add PR11.11a fixtures, proof inventory/checkpoint coverage, and docs updates for the shipped method-syntax surface

Why

PR11.11a is the first composition milestone slice. This keeps the implementation as source sugar over the existing function model, without changing MIR, runtime behavior, or machine-facing artifact versions.

Validation

• cd compiler_impl && alr build
• python3 scripts/run_tests.py -> 729 passed, 1 skipped, 0 failed
• python3 scripts/run_samples.py -> 19 passed, 0 failed
• python3 scripts/run_proofs.py -> 178 proved, 0 failed
• PR11.11a checkpoint: 2 proved, 0 failed

[Copilot]

Pull request overview

Implements PR11.11a “method syntax” as source-level sugar by adding receiver-parameter declarations and rewriting selector calls (value.method(...)) into ordinary first-parameter calls, including support for imported public functions and existing list/map builtins.

Changes:

• Extend parsing + AST/schema to represent an optional receiver parameter on subprogram specifications.
• Add resolver support to desugar receiver.method(args) into method(receiver, args) with ambiguity detection and builtin participation.
• Add fixtures + harness updates (tests, proofs, docs/spec) covering method syntax, builtin method sugar, and imported/ambiguous cases.

Reviewed changes

Copilot reviewed 20 out of 20 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
tests/positive/pr1111a_method_syntax.safe	Positive fixture for receiver declarations and method-call desugaring.
tests/negative/neg_pr1111a_remove_stmt_method.safe	Negative fixture ensuring remove (value-returning) isn’t admitted as a call statement via method sugar.
tests/negative/neg_pr1111a_mut_receiver_constant.safe	Negative fixture enforcing mut receiver requires writable target.
tests/negative/neg_pr1111a_append_expr.safe	Negative fixture enforcing append can’t be used as an expression via method sugar.
tests/interfaces/client_optional_method.safe	Interface fixture: imported public function callable via method sugar.
tests/interfaces/client_optional_method_ambiguous.safe	Interface reject fixture: ambiguity between local and imported method candidates.
tests/interfaces/client_list_method.safe	Interface fixture: builtin/stdlib-like method sugar on list operations.
tests/interfaces/client_imported_method_observe.safe	Interface fixture: imported methods with ownership/observe patterns.
tests/build/pr1111a_builtin_methods_build.safe	Build fixture exercising builtin container operations using method sugar.
spec/08-syntax-summary.md	Spec updates documenting receiver clause syntax and selector-call sugar for builtins.
scripts/run_tests.py	Registers new interface cases, reject case, AST contract, and build fixture expected output.
scripts/run_proofs.py	Adds PR11.11a checkpoint group execution and summary reporting.
scripts/_lib/proof_inventory.py	Adds PR11.11a checkpoint fixture manifest and includes it in coverage paths.
docs/tutorial.md	Tutorial section documenting receiver declarations and method-call sugar semantics.
docs/PR11.x-series-proposed.md	Roadmap notes updated to reflect completed milestones + expanded PR11.11a description.
compiler/ast_schema.json	Adds receiver field to procedure/function specifications in the AST schema.
compiler_impl/src/safe_frontend-check_parse.adb	Parses optional receiver parameter clause before subprogram name.
compiler_impl/src/safe_frontend-check_model.ads	Adds Has_Receiver + Receiver to Subprogram_Spec.
compiler_impl/src/safe_frontend-check_emit.adb	Emits receiver parameter into JSON AST for procedure/function specifications.
compiler_impl/src/safe_frontend-check_resolve.adb	Implements method-call rewrite/desugaring and integrates it into apply resolution.

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