[latekvo]

Closes #1143

LogFileWriter stores the level uppercased, and parseFlatLine lowercased it back. So startGroup, startGroupCollapsed, endGroup, profileEnd and timeEnd came back all-lowercase from readAll()/readFiltered(). The parser now maps those 5 CDP types back to their canonical spelling. The on-disk format is unchanged. A test in log-file-writer-level.test.ts pins all 5 through readAll() and readFiltered() (fails with the fix reverted).

The impact today is limited to the contract. readAll()'s only production caller is the console socket's backlog replay, and nothing has read consoleSocketUrl since #66 (filed as #1575). readFiltered() has only test callers.

No docs update needed.

Verification

Two throwaway vitest probes, neither committed:

1. All 18 Runtime.consoleAPICalled types written through the real LogFileWriter, then compared with what readAll() and readFiltered({ level }) return.
2. The real Chromium JS-runtime-debugger blueprint on a fake CDP. It emits all 18 types, connects a WebSocket to consoleSocketUrl, emits them again, and compares backlog levels with live levels.

cd packages/tool-server && npx vitest run test/debugger/zz-i1143-repro.test.ts test/zz-i1143-verify.test.ts --silent=false

Before (fix reverted):

MISMATCHES: [["startGroup","startgroup"],["startGroupCollapsed","startgroupcollapsed"],["endGroup","endgroup"],["profileEnd","profileend"],["timeEnd","timeend"]]
filter startGroup total: 0
filter timeEnd total: 0
BACKLOG: [...,"startgroup","startgroupcollapsed","endgroup",...,"profileend","count","timeend"]
LIVE:    [...,"startGroup","startGroupCollapsed","endGroup",...,"profileEnd","count","timeEnd"]
Tests  2 failed (2)

After: Tests 2 passed (2). Backlog levels equal live levels for all 18 types.

Checks:

• npx tsc --build: exit 0
• vitest run test/debugger test/*js-runtime-debugger*.test.ts: 23 files / 252 tests passed
• prettier and eslint on the touched file: clean

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[latekvo]

Folded into #1753 as b8750c5, to review together with the other capture fixes.