Add documentation site + refresh crate READMEs

[Sewer56]

This adds a proper documentation site for the project and brings all the crate READMEs up to date.

New: MkDocs site (docs/)

• 12 pages covering agents, tools, sandboxing, getting started, etc.
• Custom dark theme, GitHub Pages deploy workflow, local dev helper

Rewrite: READMEs

• Top-level README repositioned as "OpenCode for servers"
• All crate READMEs: consistent links, expanded permission docs, updated model examples

Fix: API docs

• Missing #[doc] links on public fs functions
• Stale intra-doc links in loader.rs

Minor: fixture punctuation, Cargo.lock, .gitignore

45 files, +3,490 −167

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 6c8e0c91-eb30-4040-91e1-f18373f4e527

📥 Commits

Reviewing files that changed from the base of the PR and between b3c8519 and ac64d74.

⛔ Files ignored due to path filters (1)

• src/Cargo.lock is excluded by !**/*.lock

📒 Files selected for processing (39)

• .github/workflows/deploy-mkdocs.yml
• .gitignore
• README.MD
• SANDBOX-PROFILES.md
• docs/.gitignore
• docs/mkdocs.yml
• docs/requirements.txt
• docs/src/agents.md
• docs/src/architecture.md
• docs/src/assets/landing.css
• docs/src/comparison.md
• docs/src/examples.md
• docs/src/feature-flags.md
• docs/src/getting-started.md
• docs/src/guides/custom-framework.md
• docs/src/index.md
• docs/src/migration.md
• docs/src/models-catalog.md
• docs/src/sandboxing.md
• docs/src/tools.md
• docs/src/vendor/Reloaded/Images/Nexus-Heart-40.avif
• docs/src/vendor/Reloaded/Images/Nexus-Icon-40.avif
• docs/src/vendor/Reloaded/Images/Reloaded-Heart-40.avif
• docs/src/vendor/Reloaded/Images/Reloaded-Icon-40.avif
• docs/src/vendor/Reloaded/Stylesheets/reloaded.css
• docs/start_docs.py
• src/llm-coding-tools-agents/ARCHITECTURE.md
• src/llm-coding-tools-agents/Cargo.toml
• src/llm-coding-tools-agents/README.md
• src/llm-coding-tools-agents/benches/fixtures/orchestrator-quality-gate-gpt5.md
• src/llm-coding-tools-agents/src/runtime/mod.rs
• src/llm-coding-tools-agents/src/runtime/model.rs
• src/llm-coding-tools-bubblewrap/ARCHITECTURE.md
• src/llm-coding-tools-bubblewrap/README.md
• src/llm-coding-tools-core/README.md
• src/llm-coding-tools-models-dev/README.md
• src/llm-coding-tools-serdesai/AGENTS-ARCHITECTURE.md
• src/llm-coding-tools-serdesai/README.md
• src/llm-coding-tools-serdesai/src/agent_ext.rs

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch improve-readme-new-new

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.98%. Comparing base (b3c8519) to head (ac64d74).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #110      +/-   ##
==========================================
- Coverage   81.04%   80.98%   -0.07%     
==========================================
  Files         110      110              
  Lines        4517     4517              
==========================================
- Hits         3661     3658       -3     
- Misses        856      859       +3     

Flag	Coverage Δ
async	80.22% <ø> (-0.07%)	⬇️
blocking	58.12% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
src/llm-coding-tools-agents/src/runtime/model.rs	68.42% <ø> (ø)
src/llm-coding-tools-serdesai/src/agent_ext.rs	55.55% <ø> (ø)

... and 1 file with indirect coverage changes

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