Add standard .golangci.yml (refs #59)

Copied byte-for-byte from the vendored policy set in sneak/prompts.
The new config surfaces 2,990 lint findings; remediation is tracked
in issue #61 rather than being bundled here, so #59 stays open until
make check is green under this config.

TODO.md

@@ -14,12 +14,16 @@ pre-1.0
 
 # Next Step
 
-Bring the repo into policy compliance in one commit: add REPO_POLICIES.md
-(copied from sneak/prompts), .editorconfig, and .golangci.yml. Verify
-`make check` stays green with the new lint config.
+Remediate the 2,990 lint findings surfaced by the standard
+`.golangci.yml` (issue #61): behavior-preserving fixes in per-linter or
+per-package chunks, mechanical linters first, until `make check` is
+green on `main`.
 
 # Completed Steps
 
+- 2026-08-07: Added the standard `.golangci.yml` and `.editorconfig`
+  (issue #59); lint findings under the new config are tracked in issue
+  #61. `script/bootstrap` now installs sqlite3 (needed by tests).
 - 2026-07-07 Adopted scripts-to-rule-them-all: `script/` entrypoints,
   Makefile shims, README Entrypoints section
 - 2026-07-02: Consolidated CLI verbs, retired overlapping commands; bound
@@ -42,7 +46,6 @@ Bring the repo into policy compliance in one commit: add REPO_POLICIES.md
 
 # Future Steps
 
-- Add REPO_POLICIES.md, .editorconfig, .golangci.yml (the Next Step).
 - Reconcile the uncommitted ARCHITECTURE.md edits on main: finish and
   commit, or revert.
 - Review stale local branches (add-godoc-to-cli-package,