Add architecture drift ratchets

[bglusman]

Summary

• add an architecture ratchet script that pins current oversized Rust module budgets and reports watched drift patterns
• wire the ratchet into CI docs checks
• teach AGENTS/Copilot review guidance to flag concrete architecture drift
• start splitting commands.rs by moving parser/token helpers into commands/parser.rs with focused tests

Stack

• Stacked on Stage placeholder injection primitives #172 (issue-151-placeholder-main) because the placeholder PR still touches security-proxy and config files used by the ratchet baseline.

Validation

• ruby scripts/check-architecture-ratchets.rb
• ruby scripts/check-docs-site.rb
• cargo fmt --all -- --check
• git diff --check pr-172-latest..HEAD

[qodo-code-review]

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[Copilot]

Pull request overview

Adds an “architecture drift ratchet” to keep oversized Rust modules from growing unintentionally, surfaces a few drift-related metrics in CI output, and starts splitting crates/calciforge/src/commands.rs by extracting command parsing/suggestion helpers into a dedicated submodule with unit tests.

Changes:

• Introduces scripts/check-architecture-ratchets.rb to enforce per-file Rust line budgets and report counts of watched drift patterns.
• Wires the ratchet script into the CI docs job.
• Extracts command parsing + fuzzy suggestion helpers into crates/calciforge/src/commands/parser.rs and updates commands.rs to use it.
• Updates AGENTS.md and Copilot/Rust review instructions to explicitly call out architecture drift patterns worth flagging.

Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
scripts/check-architecture-ratchets.rb	New CI ratchet enforcing Rust module line budgets + reporting drift pattern counts.
crates/calciforge/src/commands/parser.rs	New commands submodule for token/arg parsing and command suggestion, with tests.
crates/calciforge/src/commands.rs	Wires in the new parser submodule and removes duplicated helper implementations.
AGENTS.md	Adds contributor guidance about large-file budgets and architecture drift patterns.
.github/workflows/ci.yml	Runs the architecture ratchet script as part of docs checks.
.github/instructions/rust.instructions.md	Adds explicit review guidance around boundary hygiene and owned background work.
.github/copilot-instructions.md	Elevates “architecture drift” in review priorities and documents the new ratchet tool.