pampa: migrate FileId scheme from sequential to hash-based (bd-ky14a)

Pampa's ASTContext now derives FileIds via
`quarto_yaml::file_id_for_filename(name)` (hashing the filename
string) instead of using sequential `FileId(0)` for the document's
primary file. This makes pampa's `SourceInfo`s globally
interchangeable with `SourceInfo`s produced by quarto_yaml (and any
other parser using the same recipe), eliminating the
out-of-band-binding requirement that bd-1pwy8 had to work around
with `(FileId, &Path)` candidate pairs.

## What changed

### Core: ASTContext gains a primary_file_id field

`crates/pampa/src/pandoc/ast_context.rs`
- New private field `primary_file_id: FileId`, cached at
  construction so `current_file_id()` doesn't re-hash on every
  call.
- `new()` and `anonymous()` now delegate to `with_filename(name)`
  with the `<unknown>` / `<anonymous>` placeholder names.
- `with_filename` computes the FileId via
  `quarto_yaml::file_id_for_filename` and registers the
  SourceContext entry via `add_file_with_id`.
- New `from_parts(filenames, source_context, primary_file_id)`
  constructor for deserialization paths (the JSON reader uses
  this).

### Production sites updated to use hash-based FileIds

- `crates/pampa/src/readers/qmd.rs` — registers the input under
  `current_file_id()` (= hash) instead of the sequential 0.
- `crates/pampa/src/readers/json.rs` — when deserializing
  ASTContext, computes each file's hash FileId and uses the new
  `SourceContext::add_file_with_id_and_info` helper to preserve
  the line-break index.
- `crates/quarto-core/src/stage/stages/parse_document.rs` — the
  SourceContext built in the parse stage now uses
  `add_file_with_id(file_id_for_filename(source_name), …)` so
  it matches what pampa puts on the AST's SourceInfos.
- `crates/quarto-core/src/pipeline.rs` (q2-preview path) — same
  treatment.
- `crates/perf-harness/src/bin/parse_qmd_to_ast.rs` — replaces
  struct-literal ASTContext construction with `from_parts`.
- `crates/wasm-quarto-hub-client/src/lib.rs` — same.
- `crates/quarto-lsp-core/src/document.rs`
  (`Document::create_source_context*`) — registers the document
  under the hash FileId so analyze_document's SourceInfos resolve.
- `crates/quarto-core/src/transforms/attribution_render.rs` — the
  v1 "skip non-primary file" gate previously compared `file_id != 0`;
  now it compares against the AST-derived primary file_id.

### Simplifications enabled by the new scheme

- `crates/quarto-core/src/stage/stages/include_expansion.rs` —
  dropped the `quarto_ast_reconcile::remap_file_ids(FileId(0) →
  new_sequential_id)` workaround and the parallel-SourceContext
  lockstep with the `debug_assert_eq!` desync check. Included
  sub-documents now land at `FileId(hash(filename))` natively;
  registration in the parent's contexts is idempotent on FileId.
- `crates/quarto-core/src/stage/stages/engine_execution.rs` —
  same: dropped the `remap_file_ids(id.0 + 1)` shift; the
  intermediate `.rmarkdown` already has its hash FileId.

### Source-map helper

- `crates/quarto-source-map/src/context.rs` — new
  `add_file_with_id_and_info` method, combining the existing
  `add_file_with_id` (specific FileId, can panic if duplicate)
  with `add_file_with_info` (pre-computed FileInformation).
  Needed by the JSON deserializer's roundtrip path.

## Contract tests (the TDD anchor)

Five new tests across the workspace. Each one fails on `main` with
the expected `FileId(0)` vs `FileId(hash)` mismatch and turns
green after the migration:

1. `pampa::pandoc::ast_context::tests::bd_ky14a_with_filename_uses_quarto_yaml_file_id`
2. `pampa::pandoc::ast_context::tests::bd_ky14a_source_context_indexed_by_hash_file_id`
3. `quarto_core::bd_ky14a_file_id_contract::bd_ky14a_pampa_qmd_read_uses_quarto_yaml_file_id`
4. `quarto_core::bd_ky14a_file_id_contract::bd_ky14a_sub_document_file_id_is_hash_based`
5. `quarto_core::bd_ky14a_file_id_contract::bd_ky14a_fresh_source_context_renders_pampa_source_info`

## Pre-existing tests touched

- `pampa::tests::json_location_test::test_json_location_enabled`
  — assertion `location["f"] == 0` updated to `file_id_for_filename`.
- `pampa::tests::qmd_writer_source_info::round_trip_code_block_offset_accuracy`
  — test fixture's `SourceContext` now uses `add_file_with_id`
  with the hash FileId, matching the SourceInfos that come out
  of the parser.
- `quarto-core::stage::stages::engine_execution::tests::test_engine_execution_remaps_new_blocks_to_intermediate`
  — expected FileIds updated to the hashes of the two filenames
  involved.
- `quarto-core::stage::stages::include_expansion::tests::included_blocks_have_correct_file_id`
  — same.
- `pampa::pandoc::ast_context::tests::test_primary_file_id` /
  `test_current_file_id` — assert against the hash, not literal
  `FileId(0)`.

## Snapshot test changes

**62 snapshot files updated** in `crates/pampa/snapshots/json/`.
The diffs are exclusively `"d": 0` → `"d": <hash>` substitutions
in the `sourceInfoPool` entries for `Original` SourceInfos (entries
with `"t":0`). Pool *index* values (small integers in non-`d`
positions) are unchanged. No semantic changes — just the FileIds
that pampa now emits.

Affected snapshot files (sample, see git diff for the full set):

- `001.snap`, `002.snap`, `003.snap`
- `anchor-shorthand-{01..06}-*.snap` (6 files)
- `header-autoid-*.snap` (3 files)
- `horizontal-rules*.snap` (2 files)
- `html-comment-{01..48}-*.snap` (48 files)
- `math-with-attr.snap`, `table-alignment.snap`,
  `table-caption-attr.snap`, `yaml-tags.snap`

## Verification

- `cargo nextest run --workspace` → 9418 passed, 0 failed.
  (Net new: 5 contract tests; otherwise the count matches the
  bd-1pwy8 baseline.)
- `cargo xtask verify` (full pass — Rust + WASM + hub-client +
  tests) → green.

## Workflow

Per the plan, this PR should be **reviewed by the parallel
source-location workstream** before merging. Push as a feature
branch; do **not** merge to main locally.

Plan: claude-notes/plans/2026-05-22-pampa-hash-fileids.md

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: cscheid

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crates/pampa/snapshots/json/001.snap

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crates/pampa/snapshots/json/anchor-shorthand-02-in-paragraph.snap

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crates/pampa/snapshots/json/anchor-shorthand-03-hyphenated.snap

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