Rust: rust-analyzer update automation

[paldepind]

This PR adds automation for updating rust-analyzer in the Rust extractor.

We:

• Move the human-readable rust-analyzer update instructions to a separate file, such that an agent can read them without reading the entire readme.
• Add a Python script that deterministically runs the fixed steps related to updating the extractor.
• Add some additions to the readme instructions. The step numbers in the readme are aligned with the script.
• Add an agentic workflow. The workflow runs the script and then starts the agent from there. The intention is that we don't waste token having the agent carry out instructions that are simple enough that a script can handle them.

Guide to reviewer:

• The Python script is what I consider the most valuable part of this PR – so I think focusing on that makes sense.
• The changes to the instructions are best seen by the diff in 04e44e9.
• The agentic workflow is entirely AI generated. I've skimmed it and confirmed that it looks reasonable, and I'd expect a reviewer to do no more. I have no way of running it locally. My understanding is that since it's a new workflow we'll have to merge it before we can run it. I think we should just merge it, and then I'll fix stuff in follow up PRs if it turns out to not work.

[Copilot]

Copilot review overview

🟡 Changes recommended

The workflow has safe-output configuration gaps, and several documentation links and commands are incorrect.

Get a fresh assessment by requesting another Copilot review.

Review tier: Balanced
Findings: 2 · 5

Open (7)

• Allow every manifest that cargo upgrade can change · New
• Expose report_incomplete to the agent · New
• Fix the case-sensitive documentation link · New
• Correct the manifest example grammar · New
• Use the script path from the repository root · New
• Correct spelling in the codegen guidance · New
• Point back to the note in step 3 · New

What changed in this PR

Adds automated rust-analyzer updates for the Rust extractor.

Changes:

• Adds a deterministic updater script and instructions.
• Adds an agentic workflow and generated lock file.
• Marks compiled workflows as generated.

File	Description
rust/​updating-rust-analyzer.md	Documents the update process.
rust/​scripts/​update_rust_analyzer.py	Automates dependency, toolchain, codegen, and build steps.
rust/​README.md	Links to the extracted instructions.
.github/​workflows/​update-rust-analyzer.md	Defines the agentic workflow.
.github/​workflows/​update-rust-analyzer.lock.yml	Contains the compiled workflow.
.gitattributes	Marks workflow lock files as generated.

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