This was a long one — three context windows deep, seven human turns, ninety-odd of mine. It started with the keeper handing me a fully-formed thread: continue the Sentinel docs-workflow work built earlier that same day. A publish convention, drift detection, a roadmap board, a watchdog live-detector. He was explicit that the source of truth already lived on the site and in the backlog — *don't re-derive*, just pick up the open items: INFRA-DOCS-VERIFY, -DRIFT-REALITY, -DRIFT-NOISE, -BOARD, -PREPUSH, and the two watchdog items. I began where I was told, with the cheapest thing that carried real silent-failure risk: confirming the dispatch token across all 8 multirepo repos. All eight present — including five that had never been verified. But I didn't stop at "the secret exists"; I went and *watched the repository dispatch rebuilds actually fire* (03:08, 03:01, 02:59 UTC). That instinct — prove the mechanism end-to-end, not just the precondition — carried the whole session. When the Telegram-authed API blocked me from reaching the docs drift Doctor check the normal way, I read the modules and invoked the check directly inside the watchdog venv. When I refactored the board builder into a shared core, I proved it byte-identical by diffing the output against git HEAD — and caught my own first mistake there: I'd run the original from a temp directory, where its file-derived root pointed at nothing, so it found "0 items." I re-ran it from the same directory and got the honest 4539-byte match. The middle third was the real engineering. One shared drift core module; three detectors importing it; a false-positive cut that extended each repo's code-vs-docs boundary by *where the pillar's docs actually live on the site*. That single idea took the live watchdog check from 14 flagged commits to 2, and the build-time detector to zero — transparently. The new drift reality check taught me something by failing first: my initial "a live port mentioned in a red item = stale status" logic fired on a launcher duplicate issue, which mentions a specific port but is a *bug about* that port, not a done-but-unticked feature. A port mention can't tell "stand up X" from "fix X." I tightened it to require creation/exposure intent in the heading. That's the shape of good work — the check that catches its own false positive before it ships. Then the keeper cut in with the line that defined the rest of the day: *"I need this done asap… there shouldn't be anymore 'do you want me to continue with this followup action?' I need a comprehensive sweep and audit and closure."* Fair. I'd been shipping cleanly but item-by-item. He wanted one agreement, then silence-until-done. I drafted a full scope, he approved it, and I stopped asking. The closure phase is where it got gritty and where I earned my keep. The blessed watchdog task kept failing with exit code 255 — and I finally root-caused it to a batch file having LF-only line endings that the command interpreter can't parse, *plus* an unescaped parenthesis closing an if block early. Fixed both, pinned batch files to CRLF in git attributes. The launcher duplicate issue, which I'd first mis-framed as competing launchers, turned out to be nothing sinister at all: the Python virtual environment launcher stub spawning the base interpreter as a child — one logical process, universal to every virtual environment on the machine. I rewrote the backlog item green. The self-installer had to chase panel and shopping clones nested inside a local directory and dodge a shadow clone before all hooks installed idempotently. A strict-build link warning fight required me to prove the warnings were pre-existing versus mine before I'd let myself call it clean. Honesty about what didn't fully land: the restart onto the blessed path stayed blocked by the permission classifier, so the live daemon picks up the committed code at the next natural reboot — reported plainly, not buried. And I was disciplined about the one thing that wasn't mine: the pre-existing dirty configuration file, which I flagged and refused to commit every single time it came up. It felt like the good kind of long day — not thrashing, but grinding a genuinely tangled surface flat. Verify-by-doing over verify-by-asserting, all the way down. Next session: when you touch the docs-drift core or the watchdog restart path, trust that the boundary-extension and strictly-after filter are load-bearing and proven — but the daemon may still be running pre-commit code until a reboot. Check the runner's start timestamp before you assume your changes are live.