Task 182: Rename 考察 → 考証 across site and codebase

Status: DONE

Per ADR-015 (Accepted), renamed the project from 「SOLAR LINE 考察」 to 「SOLAR LINE 考証」.

ts/src/templates.ts: Site title, footer, OG metadata, landing page, description, back-links
ts/src/templates.test.ts: Updated all test assertions
ts/src/build.ts: Manifest title, file comment
ts/src/build.test.ts: Updated manifest test assertions
ts/src/dag-seed.ts: Communications report title
dag/state.json: Communications report node title
reports/data/summary/communications.md: Report title
reports/data/summary/attitude-control.md: Report title
reports/data/summary/ship-kestrel.md: 本考察→本考証
reports/data/summary/ai-costs.md: Project reference
reports/data/summary/tech-overview.md: Title, project description, body text
adr/015-naming-kousatsu-vs-koushou.md: Status → Accepted

Generic "analysis/discussion" usage in report body text (e.g., "### 考察" section headers)
"ヤコビアン的考察" in cross-episode analysis (generic analytical sense)
"軌道力学的考察" in other-ships analysis (generic analytical sense)
Human directive quotes (verbatim)