refactor: consolidate result-table folders into results/ (#691)

[grzanka]

Summary

Closes #691. Consolidates the two confusingly-named, near-identical result-table
locations under src/lib/components/ into a single canonical results/
directory, so the component tree is self-documenting and contributors no longer
have to open files to learn which table is which.

Moves (all via git mv, history preserved)

• result-table.svelte → results/table-multi-program.svelte (the multi-program comparison table)
• result-table/ partials → results/multi-program/:
  • advanced-header, advanced-result-cells, basic-header, basic-result-cells, input-row-cells, multi-entity-cells, multi-entity-header, types
  • result-table-footer.svelte → footer.svelte (drops the last result-table filename)
• Tests renamed: result-table.test.ts → table-multi-program.test.ts, result-table-advanced.test.ts → table-multi-program-advanced.test.ts

Other changes

• Updated all imports: the multi-program table's relative partial imports, the two header partials' cross-folder import simplified to ../stp-unit-header-menu.svelte (now siblings under results/), the calculator page import, and the test imports.
• Updated the component tree in docs/03-architecture.md.
• AI logging: CHANGELOG-AI.md entry + session log + index update.

Pure move + rename — no logic changes. The data-testid="result-table" DOM
attribute is intentionally kept (behavioural contract relied on by E2E specs).

Acceptance criteria

• One canonical results/ directory; no result-table.svelte / result-table/ left behind.
• File names communicate purpose (multi-program table is obviously the multi-program table).
• All imports updated; pnpm check (svelte-check + tsc) passes — 0 errors.
• pnpm lint clean; moved table tests pass (21/21). (The only failing unit tests are in guard-forbidden-files.test.ts, failing because git commit signing is unavailable in the sandbox — unrelated to this change.)
• Component tree in docs/03-architecture.md updated.

Test plan

• pnpm check → 0 errors, 0 warnings
• pnpm lint → clean
• pnpm format:check → clean
• pnpm vitest run for the two moved table specs → 21/21 pass

https://claude.ai/code/session_01AQB6xXACbSPK2DePe2QSoT

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Generated by Claude Code

[Copilot]

Pull request overview

This PR consolidates the previously split multi-program result table implementation (formerly result-table.svelte + result-table/ partials) into the canonical src/lib/components/results/ subtree, aiming to make the component tree self-describing and remove ambiguous folder naming.

Changes:

• Updated calculator page + unit/component tests to import the multi-program table from src/lib/components/results/table-multi-program.svelte.
• Moved/renamed the multi-program table partials under src/lib/components/results/multi-program/ and updated internal imports (including simplifying StpUnitHeaderMenu imports).
• Updated architecture documentation and AI session logging to reflect the new component tree.

Reviewed changes

Copilot reviewed 10 out of 17 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
src/tests/components/table-multi-program.test.ts	Updates test import to the new multi-program table path under results/.
src/tests/components/table-multi-program-advanced.test.ts	Updates advanced-mode test import to the new multi-program table path under results/.
src/routes/calculator/+page.svelte	Updates calculator page import to use results/table-multi-program.svelte.
src/lib/components/results/table-multi-program.svelte	Updates internal imports to use ./multi-program/* partials and moved types import.
src/lib/components/results/multi-program/types.ts	Introduces/relocates ColumnDef typing for the multi-program table.
src/lib/components/results/multi-program/multi-entity-header.svelte	Simplifies StpUnitHeaderMenu import to a sibling-relative path.
src/lib/components/results/multi-program/multi-entity-cells.svelte	Relocates/introduces multi-entity comparison cell rendering for the multi-program table.
src/lib/components/results/multi-program/input-row-cells.svelte	Relocates/introduces row input cell rendering for the multi-program table.
src/lib/components/results/multi-program/footer.svelte	Relocates/renames the multi-program table footer component.
src/lib/components/results/multi-program/basic-result-cells.svelte	Relocates/introduces basic-mode result cell rendering for the multi-program table.
src/lib/components/results/multi-program/basic-header.svelte	Relocates/introduces basic-mode table header rendering for the multi-program table.
src/lib/components/results/multi-program/advanced-result-cells.svelte	Relocates/introduces advanced-mode result cell rendering for the multi-program table.
src/lib/components/results/multi-program/advanced-header.svelte	Simplifies StpUnitHeaderMenu import to a sibling-relative path.
docs/ai-logs/README.md	Adds an index entry for the AI session log covering this refactor.
docs/ai-logs/2026-06-04-issue-691-consolidate-result-tables.md	Adds the detailed AI session log for the consolidation work.
docs/03-architecture.md	Updates the component tree documentation to reflect the new results/ structure.
CHANGELOG-AI.md	Adds the changelog entry linking to the new AI session log.