revert(ci): undo "force clang for Linux x86_64 native builds" (#1059) (#1061)

Reverts 1e292ef. The premise of #1059 was that gcc-built binaries
silently dropped HCL files where clang-built ones did not — making the
v3.10.0 pre-publish gate fail. Closer empirical verification (running
both compilers against the same source in identical Docker containers,
counting "Native orchestrator dropped" warnings explicitly) showed that
both compilers produce binaries that drop .tf files. The earlier
"clang doesn't drop" reading was an output-filtering artifact in my
local benchmark grep.

The real cause is a tree-sitter ABI version mismatch — `tree-sitter-hcl`
1.1.0 ships ABI 15, runtime is pinned at ABI 14. `Parser::set_language`
rejects the grammar at runtime regardless of which compiler built the
binary. The proper fix is to bump `tree-sitter` to 0.25; that is being
delivered separately.

Reverting the clang change keeps Linux x86_64 GNU users on the
runner-default `cc` (gcc), matching every release prior to v3.10.0
and avoiding compiler-specific dead weight in our CI config that
fixes nothing.

Refs #1054

Author: carlos-alm

.github/workflows/build-native.yml

@@ -72,17 +72,6 @@ jobs:
         with:
           workspaces: crates/codegraph-core
 
-      # Force clang for the host x86_64-linux-gnu build. With gcc (the runner's
-      # default `cc`) the bundled C parsers in tree-sitter-hcl produce a binary
-      # whose HCL extractor silently drops files (#1054). Clang produces a
-      # working binary.
-      - name: Use clang for x86_64-linux-gnu
-        if: matrix.target == 'x86_64-unknown-linux-gnu'
-        run: |
-          clang --version
-          echo "CC=clang" >> "$GITHUB_ENV"
-          echo "CXX=clang++" >> "$GITHUB_ENV"
-
       - name: Install cross-compilation tools (aarch64-gnu)
         if: matrix.target == 'aarch64-unknown-linux-gnu'
         run: |

.github/workflows/ci.yml

@@ -61,20 +61,6 @@ jobs:
         with:
           workspaces: crates/codegraph-core
 
-      # NOTE: this step was added in #1059 on the assumption that gcc-vs-clang
-      # was responsible for the HCL .tf drop in #1054, but the real root cause
-      # was a tree-sitter ABI mismatch (HCL grammar shipped ABI 15 while the
-      # runtime was pinned at ABI 14). That is fixed by the tree-sitter 0.25
-      # bump in this PR, so this clang override is now redundant. Kept in place
-      # here to keep this PR scoped to the ABI fix; a follow-up revert removes
-      # the step entirely.
-      - name: Use clang on Linux
-        if: matrix.os == 'ubuntu-latest'
-        run: |
-          clang --version
-          echo "CC=clang" >> "$GITHUB_ENV"
-          echo "CXX=clang++" >> "$GITHUB_ENV"
-
       - name: Install napi-rs CLI
         run: npm install -g @napi-rs/cli@3
 

.github/workflows/publish.yml

@@ -44,15 +44,6 @@ jobs:
         with:
           workspaces: crates/codegraph-core
 
-      # Match the build-native job: gcc-built tree-sitter parsers drop files
-      # on Linux x86_64 (#1054). Use clang here too so preflight parity tests
-      # exercise the same binary characteristics as the published artifact.
-      - name: Use clang for native build
-        run: |
-          clang --version
-          echo "CC=clang" >> "$GITHUB_ENV"
-          echo "CXX=clang++" >> "$GITHUB_ENV"
-
       - name: Install napi-rs CLI
         run: npm install -g @napi-rs/cli@3
 
@@ -187,18 +178,6 @@ jobs:
         with:
           workspaces: crates/codegraph-core
 
-      # Force clang for the host x86_64-linux-gnu build. With gcc (the runner's
-      # default `cc`) the bundled C parsers in tree-sitter-hcl produce a binary
-      # whose HCL extractor silently drops files (#1054), triggering an
-      # expensive WASM backfill on every build call. Clang produces a working
-      # binary. Verified locally: gcc 14.2.0 drops .tf files, clang does not.
-      - name: Use clang for x86_64-linux-gnu
-        if: matrix.target == 'x86_64-unknown-linux-gnu'
-        run: |
-          clang --version
-          echo "CC=clang" >> "$GITHUB_ENV"
-          echo "CXX=clang++" >> "$GITHUB_ENV"
-
       - name: Install cross-compilation tools (aarch64-gnu)
         if: matrix.target == 'aarch64-unknown-linux-gnu'
         run: |