fix(rebrand): full-cutover rename miner/AMS per-repo and operator config filenames

[JSONbored]

Summary

• Rebrand epic Epic: complete the gittensory -> loopover rebrand (full cutover, no dual-support) #5705, Phase 8a follow-up: renames the two remaining unrenamed config-file surfaces in the miner package — .gittensory-miner.yml/.json (per-target-repo miner goal spec, MINER_GOAL_SPEC_FILENAMES) and .gittensory-ams.yml/.json (operator-local AMS execution policy, AMS_POLICY_SPEC_FILENAMES) — to .loopover-miner.* / .loopover-ams.*.
• Includes the .env sibling and all four checked-in .example files, .gitignore entries, and — the one genuinely functional gap — docker-compose.miner.yml's env_file: directive, which was still pointing at the old bare filename.
• Fixes directly-adjacent stale prose in prometheus/rules/alerts.yml (a runbook CLI-command example and .gittensory-ams.yml path mentions) discovered while verifying.

Deliberately not touched (distinct, larger-blast-radius surfaces, left for a dedicated follow-up):

• The Prometheus rule group names (gittensory-miner-prediction/-portfolio-queue/-governor) and the up{job="gittensory"} scrape-job label in the same file
• The ~150+ gittensory-miner mentions in test describe()/tmpdir-prefix strings across the suite (cosmetic, non-functional)

Test plan

• npm run typecheck clean
• npx vitest run — 838 files / 16257 tests passed (2 pre-existing skips)
• full npm run test:ci gate green end-to-end
• npm run docs:drift-check / npm run manifest:drift-check clean

[superagent-security]

Superagent didn't find any vulnerabilities or security issues in this PR.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.07%. Comparing base (210a8b1) to head (73aba24).
⚠️ Report is 1 commits behind head on main.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #5765   +/-   ##
=======================================
  Coverage   95.07%   95.07%           
=======================================
  Files         582      582           
  Lines       46183    46183           
  Branches    14812    14812           
=======================================
  Hits        43907    43907           
  Misses       1516     1516           
  Partials      760      760           

Flag	Coverage Δ
shard-1	43.95% <50.00%> (ø)
shard-2	35.74% <100.00%> (ø)
shard-3	32.26% <50.00%> (ø)
shard-4	32.94% <100.00%> (ø)
shard-5	31.74% <100.00%> (ø)
shard-6	44.66% <100.00%> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
packages/loopover-engine/src/ams-policy-spec.ts	100.00% <100.00%> (ø)
packages/loopover-engine/src/fleet-run-manifest.ts	100.00% <ø> (ø)
packages/loopover-engine/src/focus-manifest.ts	99.10% <ø> (ø)
...ckages/loopover-engine/src/governor/action-mode.ts	90.00% <ø> (ø)
...ckages/loopover-engine/src/governor/kill-switch.ts	100.00% <ø> (ø)
...oopover-engine/src/governor/reputation-throttle.ts	100.00% <ø> (ø)
packages/loopover-engine/src/miner-goal-spec.ts	100.00% <ø> (ø)
...ckages/loopover-engine/src/miner/iterate-policy.ts	12.50% <ø> (ø)
...ges/loopover-engine/src/phase7-calibration-loop.ts	44.38% <ø> (ø)
packages/loopover-miner/lib/ams-policy.js	93.33% <100.00%> (ø)
... and 9 more

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