docs(readme): refresh stats + news + Core Systems for image/ESC work

[ericleepi314]

Summary

Refresh of the README News + Status sections to cover the work that landed since the previous codebase-stats note on 2026-05-14.

Codebase stats

• Total Python files: 894 (was 837)
• Total LOC: 177,428 lines (was 167,034)
• Two-day delta: ~+10.4k lines, mostly ESC cancellation hardening (fix(esc): cancel streaming API call when abort signal trips #144–fix(esc): worker-thread iteration for OpenAI-compat streaming (LiteLLM hang fix) #148) and image-handling parity (fix(read): remove buggy MIME check, add image branch (TS parity) #149/feat(read): port TS image-handling pipeline to Python (Tier C parity) #154/fix: @image.png mentions hallucinate; image tool_result stringified #155/fix(image-handling): close 4 audit follow-ups from PR #155 #156).

News entries added

• 2026-05-16 Image-handling parity (Tier C, fix(read): remove buggy MIME check, add image branch (TS parity) #149/feat(read): port TS image-handling pipeline to Python (Tier C parity) #154/fix: @image.png mentions hallucinate; image tool_result stringified #155/fix(image-handling): close 4 audit follow-ups from PR #155 #156) — Read tool TS image pipeline; @image.png mention fix; image tool_result list shape preserved through _dispatch_single_tool; OpenAI-compat image / document block translation with tool_use_id correlation across the tool→user split; validate_images_for_api promoted into BaseProvider._prepare_messages; BOM-aware text decoding.
• 2026-05-16 Subagent + Bash reliability — custom subagent discovery from .claude/agents/ (fix(agent): discover custom subagents from .claude/agents/ #151); Bash timeout vs ESC-abort distinction (fix(bash): distinguish timeout from ESC-abort in tool_result #152); async-subagent AbortController isolation tests (test(esc): pin async-subagent abort-controller isolation invariants #153); REJECT_MESSAGE on cancelled production path (fix(esc): override cancelled tool_result with REJECT_MESSAGE in production path #150).
• 2026-05-15 to 2026-05-16 ESC cancellation hardening across providers (fix(esc): cancel streaming API call when abort signal trips #144–fix(esc): worker-thread iteration for OpenAI-compat streaming (LiteLLM hang fix) #148) — mid-stream cancel under ~50ms for every provider; shared StreamAbortGuard; LiteLLM worker-thread iteration fix.

Core Systems updates

• Multi-Provider description extended to call out Anthropic→OpenAI image / document block translation.
• New Cancellation / Abort row (✅) capturing the cross-provider ESC sweep + subagent abort isolation + Bash timeout/ESC distinguishability.
• New Image Handling row (✅) capturing the Tier C parity: Read pipeline, @image.png inlining, pre-API size validation, binary @-mention routing.

Test plan

• Diff is README-only (+7 / -2).
• Stats verified via find src tests scripts -name '*.py' -not -path '*/__pycache__/*' | wc -l (894) and find ... -exec cat {} + | wc -l (177,428).
• News dates / PR numbers cross-checked against git log origin/main bfa1647..HEAD.

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