Add standard Workflow section to TODO.md

TODO.md

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+# Workflow
+
+* branch (from `main`)
+* do the work in Next Step
+* move Next Step to the top of Completed Steps
+* move the top item of Future Steps into Next Step
+* commit (`TODO.md` changes in the same commit as the work)
+* merge to `main` if the branch is not protected, otherwise open a PR
+* push
+
+# Status
+
+pre-1.0. Tagged v0.1.0 on 2026-02-27. Active development on branch
+feat/issue-144-settings-about (another agent working as of 2026-07-06).
+Full policy file set present; make check on main not verified.
+
+# Next Step
+
+Land feat/issue-144-settings-about: finish the settings About well
+(build info, app name and repo link, release date, version click easter
+egg, git info derived inside Docker), resolve the untracked scripts/
+directory (commit or gitignore), get review, merge to main.
+
+# Completed Steps
+
+- 2026-03-01: About well in settings with build info and easter egg (in
+  flight on feature branch); USD display suppressed on testnets (#142);
+  estimated USD for ETH in approve-tx view (#141).
+- Sepolia testnet support (#137); etherscan links go to token-specific
+  URLs (#136).
+- Transaction detail improvements: Type field and on-chain details
+  (#130), txid-first reordering (#133), swap display corrections
+  (#128), expanded confirm-tx warnings (#118).
+- Dark mode theme setting (Light/Dark/System) with contrast fixes
+  (#126); timestamps include timezone offset (#120); layout shift
+  audit, reserved space for error messages (#124).
+- Copy-flash visual feedback with timing tune (#113, #121);
+  cross-wallet-type duplicate detection (#115).
+- 2026-02-27: v0.1.0 tagged.
+- 2026-02-24: Initial scaffolding: popup UI, BIP-39 wallet creation via
+  ethers.js, wallet persistence, real ETH balances over RPC, ENS
+  forward and reverse resolution.
+
+# Future Steps
+
+- Verify main passes make check after the feature branch merges (not
+  verified 2026-07-06 because an agent was active in the tree); fix
+  anything red. main must always be green.
+- Prune stale branches: dozens of merged local and remote feature
+  branches remain (fix/*, feature/*, tx-*); delete merged ones locally
+  and on origin.
+- Continue the issue backlog toward a feature-complete wallet, then cut
+  further tags as milestones land.
+- Pre-1.0 security review of the extension (key handling, DEBUG mode
+  policy, RPC input validation) before any 1.0rc tag.